This is your definitive list of all apps outfitted with Apple's new push notifications. Badges, sounds and text notifications - find out what apps have them and how they're being used. Check back often as this list will be updated on an ongoing basis with all new push-capable apps.

MailTones - Email Sounds and Alerts

Price: $2.99

Ituneslink

By Electric Pocket

Sends Push Notifications with custom tones when a new email is received. Supports GMail, MobileMe, and any other mail service that allows message forwarding. Features over 25 different tones that can be applied to specific types of messages. Also features a "Do Not Disturb" that automatically stops alert at night.
What's On TV? From Zap2it

Price: Free

Ituneslink

By NapkinStudio.com

Push Notification reminders are sent when your favorite shows are about to start. i.TV runs the risk of losing the iPhone thanks to this feature. The reviews in the App Store have been mixed, but Push alone should make it at least test-worthy for anyone who watches TV regularly.
LetMeKnow

Price: Free

Ituneslink

By Andrew Christiansen

App will send you a variety of important updates via Push Notifications, including Weather, Twitter, Stocks, RSS Feeds, YouTube, CraigsList, Server Uptime, Web page changes (I wonder if this works for the Push Notification applist) and more. Make sure to read the app description carefully for how each of these notifications work to see if it fits your needs. Several reviews complained the app limits to 2 types of alerts you can use at any one time but the app description says there are 5 with the ability to purchase more.
GPush

Price: $1.99

Ituneslink

By Tiverias Apps

Nobody was sure if it would make it into the App Store, but it did. Simply, GPush is described as the "missing link between Gmail and the iPhone." Until Google finally implements Push gmail, this'll have to do. No longer will you have to wait 15 minutes to get that email, GPush gets it to your right now.
Colloquy - IRC Client

Price: $1.99

Ituneslink

By Colloquy Project

IRC geeks take note, Push Notifications are now available for the very positively reviewed Colloquy. However, it does require "a push-aware IRC bouncer.
Sportacular

Price: Free

Ituneslink

By Citizen Sports, Inc.

Much more robust Push Notification settings than SportsTap. Not only can you get alerts at the start and end of the game and when the score changes, but with Sportacular you can set a reminder 3 hours before the game starts and at the end of each inning or every 3rd inning. Not only that, but if there's an individual game you're interested in but it's one of your favorite teams isn't playing, you can set alerts specifically for that game. All this is in addition to some other cool features, like Facebook Connect and the ability to root for your time by voting that they're going to win.
Todo

Price: $9.99

Ituneslink

By Appigo

Todo is one of the best task management applications on the iPhone and version 3.0 adds Push Notifications. Unfortunately, it only notifies you when you set a specific due time for a task. It won't, for example, update the badge count at midnight with all the new tasks due that day. Though Appigo has a very good track record with updates so expect something like that in a future version.
eBay Mobile

Price: Free

Ituneslink

By eBay Inc.

Get notifications when you're outbid or when the auction is coming to an end. A truly awesome use for Push Notifications and it should inject some usefulness back into Ebay.
Guidance: Prayer Times and Adhan Notifications

Price: $2.99

Ituneslink

By Batoul Apps

An amazing app for Muslims, Guidance Pro can deliver the call to prayer five times a day via Push Notification. In addition, the app can make use of the compass inside the iPhone 3GS to help users make sure they're facing the right direction during prayer.
Gooooal 2009

Price: $1.99

Ituneslink

By eduzapps.com

Like Sportstap but for soccer. Get text alerts for every game score change from the teams you follow.
BNO News

Price: $1.99

Ituneslink

By BitMethod

One of only two news apps with Push Notifications for news updates. BNO is associated with the @breakingnews Twitter account with a following of nearly 1 million people. They're very fast. BNO News says they'll be "selective in sending out only major news updates." You can also choose to include low priority alerts too. However, it looks like they'll be trying to make this subscription based. You'll have to pay 99 cents a month for full functionality.
BargainBin With Push!

Price: Free

Ituneslink

By Proximi, Inc.

This app is made by AppAdvice.com! It is the first and only app that pushes App Store price drops. You can setup a custom watch list of apps you care about, and BargainBin will push you a message when it meets your watch price. You can also setup push subscriptions, so you can get notifications for the types of apps you never want to miss (example: popular apps that go free)
PushMail

Price: $2.99

Ituneslink

By Simon Patarin

Receive push notifications that display sender, subject, and a portion of the body of an email. Works with Gmail and any other provider that allows automatic email forwarding.
WhatsApp Messenger

Price: $0.99

Ituneslink

By WhatsApp Inc.

As AppAdvice Reader Linde points out, "WhatsApp is a chat program that uses data not SMS. It is the same concept as BBM, but with WhatsApp, you have to use your phone number instead of a pin number. You can chat with anyone with the Whatsapp app ANYWHERE in the world." You can also update your status to friends or coworkers via text alert. Unfortunately, all friends need to be using this app for it to work.
TapTrace

Price: $0.99

Ituneslink

By TapBase LLC

Send a text alert to your lost or stolen phone. If whoever has the phone clicks "view," the app will attempt to send the iPhone's location data. Unfortunately, I can't image this app being a suitable replacement for Apple's "Find My iPhone" feature of MobileMe. Though this option is much less expensive.
UNO™

Price: $4.99

Ituneslink

By Gameloft

The classic game now lets you invite your friends to play with a Push Notification.
Quordy

Price: $2.99

Ituneslink

By Lonely Star Software

Push notifications will show up as a badge and will also make a sound. When a challenge is sent, the other player will receive the same game board with the same rules. Once they have completed the challenge, Quordy will compare your results and tally your scores.
Mafia Wars by Zynga

Price: Free

Ituneslink

By Zynga

Get push notifications when your energy is full and when loot is available.
iCam (Webcam Video Streaming)

Price: $4.99

Ituneslink

By SKJM, LLC

Probably a killer app for some people, and not just the perverts and paranoid. iCam lets you see live video from up to four webcams over EDGE, 3G or Wifi. For an additional $0.99 with an In App Purchase you can activate Push Notifications when motion is detected from one of the cameras. It can take up to 5 seconds for the PN to appear. Youtube Demo: http://bit.ly/SN8q5
iDownload

Price: $1.99

Ituneslink

By Silicon Studios

This app lets you download files to your iPhone and now sends you Push Notifications for tips and bug reports.
iMobsters™ Free

Price: Free

Ituneslink

By Jeff Witt

Get real time updates about your mob via Push Notifications.
Ambiance

Price: $0.99

Ituneslink

By Urban Apps

Well-liked background noise maker will now send you Push Notifications when a new sound is available.
Yahoo! Messenger

Price: Free

Ituneslink

By Yahoo!

Able to receive push notifications while the app is closed and stay signed in for up to two full weeks.
mBox Fax & Voice

Price: Free

Ituneslink

By mBox

mBox allows you to receive faxes and voicemail at a unique mBox phone number. They are converted and sent to you via e-mail. Now you get push notifications for all the new messages. While the app is free, it requires an account from mBox that costs at least $8.95 a month.
BillMinder

Price: $0.99

Ituneslink

By return7

BillMinder is able to send you a push notification when your bills are nearing their due date. You will also be sent a push notification if a bill has been auto-paid. Push notifications are optional since the developer is charging a $.99 annual fee for the service, but they must be manually renewed, so you won't be charged without warning.
Tweet Push - Push Notifications For Twitter

Price: Free

Ituneslink

By Polar Bear Farm Ltd

Another app that pushes your tweets but is not a full-fledged Twitter client. Instead, it pops open your preferred Twitter client (Twittelator, Tweetie, Twitterfon or Twitterrific). However, unlike Boxcar, this one is subscription based. It'll cost 99 cents every month for each Twitter account you want to use it on.
SimplyTweet Twitter with Push Notifications

Price: $4.99

Ituneslink

By MotionObj

Another Twitter client that pushes your mentions and DMs. Unfortunately, it features a couple bugs in the 3.0 release that should probably get worked out before you consider buying it.
fring

Price: Free

Ituneslink

By fringland Ltd.

Fring features the ability to receive push notifications for messages received over a bunch of different services, including Skype, MSN Messenger, Google Talk, AIM, Yahoo!, ICQ, Twitter, and SIP.
Twitbit

Price: $2.99

Ituneslink

By High Order Bit

Unlike iTwitter, Twitbit is the first full-featured Twitter app that allows you to receive push notifications for mentions and direct messages without both users needing to use the same app.
Nimbuzz

Price: Free

Ituneslink

By Nimbuzz

A free chat app that allows you to receive push notifications for new chats, voicemails, messages, and files. The downside is that the app only stays logged in for up to 30 minutes.
JoinMe - The answer to " Where are you ?"

Price: Free

Ituneslink

By mobya

Extremely useful for friends and family who all have iPhones. Along the lines of Hey Where Are You (also a free push app), JoinMe allows you to get real-time updates on the distance of a friend or family member from your current location. Just send a request. If the person has JoinMe it'll be pushed to their phone. If not, it'll be e-mailed. When the user sets up the app you have a live connection, one iPhone to the other showing distance, speed and the expected arrival time of the other person.
Agile Messenger with Push

Price: $9.99

Ituneslink

By Agilemobile.com Ltd.

Another strong contender for an instant messaging app that logs you into everything and pushes your messages. Agile logs you into MSN, Yahoo, AIM, ICQ and googleTalk. Share pictures and send voice messages to your buddies over IM.
iTweetReply - Push Twitter Replies, Direct Messages and Timelines

Price: $1.99

Ituneslink

By Syncode

Also attempts to Push you Twitter replies and direct messages like Boxcar but actually gives you a little more of the functionality you would expect in a Twitter client.
Boxcar

Price: $1.99

Ituneslink

By appremix

First there was IM+, then there was iTwitter and now there is Boxcar. Each is trying to get you your Twitter messages with Push Notifications in their own way. With Boxcar, it checks your Twitter account every 2 minutes for mentions and direct mentions. If you got one it will Push you the message AND let you see it in your preferred Twitter client. Still not instant, as Twitter really should be, but it looks to be the best solution at this time.
Trapster speed trap alerts (now with Caravan and Patrol)

Price: Free

Ituneslink

By Trapster.com

Trapster is now able to alert you of speed traps, red light cameras, and speed cameras via push. You can further refine your routes, areas, days, times, and types of alerts by logging into your account via Trapster's website.
NotifyMe (Push Reminder)

Price: $3.99

Ituneslink

By PoweryBase

Create reminders and have them pushed to you. NotifyMe doesn't support app icon badges yet, but the developer states they will be available in the next update.
HappyDayz!

Price: $2.99

Ituneslink

By Oliver Fürniß

Another date reminder app that pulls information from your contacts and pushes you the information.
Occasions: Birthdays & More!

Price: $0.99

Ituneslink

By Hand Carved Code, LLC

Gets the birthdays, anniversaries and other dates from your contacts automatically and sends out Push Notifications notifying you about the event. The badge updates up to a month in advance to let you know about upcoming events.
reQall (Memory & Remembering Aid)

Price: Free

Ituneslink

By QTech, Inc.

Now you can get your reminders via Push! reQall lets you speak your notes, tasks, reminders, etc. With push notifications and other 3.0 features it's a must have app!
Prowl: Growl Client

Price: $2.99

Ituneslink

By Zachary West

Get all your Growl alerts from your Mac pushed directly to your iPhone! Not only do your latest alerts push, but you can even keep 30 days worth of growl notifications.
Live Poker by Zynga

Price: Free

Ituneslink

By Zynga

Not advertised as having push notification, but it prompts you to activate them when you install it! You can play poker with Facebook and MySpace friends as well as other iPhone users. First poker game with push notification requests!
TwitBird Pro for Twitter

Price: $2.99

Ituneslink

By NibiruTech LTD.

IM+ pushed the first tweets but iTwitter is the first full-fledged Twitter client with Push Notifications. You can receive mentions and direct messages. One catch though, you both have to be using iTwitter to receive the notification. It's a great Twitter client too.
Quake Warn

Price: $0.99

Ituneslink

By Venkatramanan Krishnamani

Want to get push notifications with the epicenter and magnitude of each nearby earthquake that hits? Okay this may sound a bit silly but in California it may come in handy. Push notifications are not working yet but an update had been submitted to Apple. Let's hope the update hits before the big one!
OneTeam 3.2 with push support

Price: $5.99

Ituneslink

By ProcessOne

Instant messaging client that lets you use your Jabber / XMPP account so you can use whatever server you wish. Geared toward business users. Now with Push Notifications.
NotifyMe Free (Push Reminder)

Price: Free

Ituneslink

By PoweryBase

Set up to 3 reminders/tasks that are sent over Push Notifications. No badges though for the app icon. That's planned for an update.
foursquare

Price: Free

Ituneslink

By foursquare

If you live in one of the cities supported you can use this with friends to find fun things to do. Still needs users though to become useful. Supports Push Notifications but unclear what their use is.
ROLANDO 2: Quest for the Golden Orchid

Price: $4.99

Ituneslink

By ngmoco, Inc.

You can challenge other players on any level by sending out a Push Notification alert.
SportsTap

Price: Free

Ituneslink

By SportsTap

Between this app and MLB At Bat your iPhone just became MLB Central. Push Notifications are sent at the beginning, end and when the score changes of games for teams you specify. Only works for Major League Baseball right now, but more sports will be added later. FYI, Push Notifications are also planned for MLB At Bat.
Toodledo - To Do List

Price: $2.99

Ituneslink

By Toodledo

Unlike Remember The Milk, Toodledo doesn't cost anything to use outside of the initial purchase. Now it supports Push Notifications for badge updates and alerts when a task is due.
touchTXT

Price: Free

Ituneslink

By AOL

Made more for the iPod Touch audience because it only works on wifi, touchTXT gives you a free method to send unlimited SMS messages.
eBuddy

Price: Free

Ituneslink

By eBuddy

Free push-capable chat app that is able to display all of your friends from various networks under one buddy list.
Remember The Milk

Price: Free

Ituneslink

By Remember The Milk

First iPhone task manager and to-do list composer that pushes! To-do's are sent to your phone at scheduled times. Requires $25 per year Pro account.
IM+

Price: $9.99

Ituneslink

IM+

By SHAPE Services

First Push-enabled Twitter app. This may be a go to app to play with the push service once it is available. IM+ 3.0 supports a plethora of popular services including, Twitter, Skype, Facebook, Yahoo, AIM, MSN, ICQ, Jabber, Google Talk, MySpace. Supports more services than BeejiveIM.
BeejiveIM with Push

Price: $5.99

Ituneslink

By Beejive, Inc.

BeejiveIM, like IM+, is a powerful chat app that lets you log into all major chat protocols. Push Notifications now included.
AIM

Price: $2.99

Ituneslink

AIM

By AOL

First Push-enabled chat app. Stay Logged in for 24 hours and receive Push Notifications when the app is closed. This is the first of many chat apps to get push notifications.
AIM (Free Edition)

Price: Free

Ituneslink

By AOL

AIM Free features Push Notifications as well but doesn't include landscape keyboard mode.
Umbrella

Price: $0.99

Ituneslink

By Whatever Software

An interesting take on a weather app. A Push Notification tells you when you should grab an umbrella.
Textfree Lite - Send Text Messages (SMS) Free!

Price: Free

Ituneslink

By Pinger, Inc.

The free version of Textfree Unlimited limits you to 15 texts a day but also pushes messages the same way.
Pollen (Push)

Price: Free

Ituneslink

By Greenality Limited

Works only in the United Kingdom. App notifies you with push notifications when pollen levels will reach a level that you've specified ahead of time.
Hey Where Are You : Location Service (HeyWAY)

Price: Free

Ituneslink

By Niftybrick Software

Ask or answer one simple question via a push notification - "Hey, Where Are You?"
QuickPigeon (Push Notification Messanger)

Price: Free

Ituneslink

By Ubiquitous Entertainment Inc.

App lets you send out quick HTML formatted e-mails to your friends. Responses come in instantly as push notifications. Great for asking quick questions and receiving instant answers. Replaces a major function of text messages.
Star Defense

Price: $0.99

Ituneslink

By ngmoco, Inc.

Send friends direct challenges via push notifications
Zillow Real Estate Search

Price: Free

Ituneslink

By Zillow.com

A numbered badge on the icon will let you know when there's a new house for sale.
E*TRADE Mobile Pro

Price: Free

Ituneslink

By E*TRADE Securities

Receive stock and account alerts by enabling the push notification feature.
Textfree Unlimited - Send Text Messages (SMS) Free!

Price: $5.99

Ituneslink

By Pinger, Inc.

3.0 update makes text messages just that much easier to kill with push notifications alerting you to new incoming messages. Give contacts your unique @textfree.us account name and say goodbye to monthly text message fees.
WeatherAlert

Price: $1.99

Ituneslink

By Figment, Inc.

Push notifications alert you to inclement weather in your area like thunderstorms, tornadoes, floods, etc.
Leaf Trombone: World Stage

Price: $0.99

Ituneslink

By Smule

The OS 3.0 update allows you to judge other performances or put yours out there for the world to see. When someone judges your performance you'll be sent a push notification to let you know.
AP Mobile

Price: Free

Ituneslink

By The Associated Press

3.0 update pushes breaking news alerts even when app is closed. You can also send articles to Evernote in the new update.
Tap Tap Revenge 2.6

Price: $0.99

Ituneslink

By Tapulous

You'll receive text alerts when a friend challenges you to a game and the app's icon will be badged with a count for unread feed items.
iDealyzer

Price: Free

Ituneslink

By Linden Indian

Never miss a limited time deal again. iDealyzer pushes deals from woot.com, sellout.woot.com, shirt.woot.com, wine.woot.com, Amazon Gold Box, Amazon Lightning, Tiger Direct and J&R. **Push update still in Apple approval process, not live yet.
RSSPush

Price: $2.99

Ituneslink

By DNet Telecom

WARNING, UNTESTED: Speccify an RSS feed and then set up keywords to receive notifications for. When a post arrives in the feed with that keywork, you apparently receive a push notification App has 2 reviews as of this writing and they're both 1 star.
Are My Sites Up

Price: Free

Ituneslink

By Shiftedfrequency

Webmasters can use this free app with the "AreMySitesUP" paid service to identify the status of their Web sites. Push Notifications will send you instant site alerts.
YoFrog Lite - Private Group Chat

Price: Free

Ituneslink

By Frog Army

Private chat rooms for you and your friends. Push notifications for new message alerts.
Truphone

Price: Free

Ituneslink

By Truphone

UNCONFIRMED: Call Skype, Google Talk and Truphone users in Wif-Fi. Description says you can now receive alerts "even when you do not have the app open." However, the words Push Notifications are not mentioned in the description.
Voice4mail - Speak Your Mail

Price: Free

Ituneslink

By Helixys, Inc

UNTESTED: Send and receive voicemails to email. App uses push notifications to tell you about new messages. It has poor reviews, but that's common for many free apps.
Quicksilver

Price: $2.99

Ituneslink

By Quantescape

The app is an XMPP/Jabber client that supports Google Talk and can connect to a server over a long term to provide push notifications of received messages to the client. Worth checking out if you use Google Talk or other XMPP/Jabber Service