iTwitter appears out of nowhere and upends the iPhone Twitter community by beating every other Twitter client to deliver the first true Push Notification tweets - for free. Unfortunately, the developer, based in China, is barred from using Twitter because the Chinese government has it blocked.

iTwitter shakes up the Twitter app landscape by beating out Twittelator, Tweetie, Twitterrific, Tweetdeck, Twitterfon and all the other major iPhone Twitter clients to become the first to deliver Push Notifications from a dedicated client. There is a catch though.

We've had a great response to our Applists so we've decided to make it a little easier to find out what's going on. We're going to begin tweeting every new app we add to our definitive lists on Push Notifications, Mapping and Peer To Peer apps. All the apps on these lists make use of iPhone OS 3.0's newest features and, so far, there aren't as many of them as you might think. However, they're trickling in all the time and we're adding them to the lists as they debut.

This week features a pair of apps for the art aficionado, a great new mapping app from one of the oldest companies in the Web-based map business, an app loaded with a ton of how-to videos and an old Twitter app gets an awesome update.

This week we'll look at a couple apps to keep in mind as you upgrade to iPhone OS 3.0 or consider buying an iPhone 3G S. We'll also check out DoGood, an app which will make you feel good about the world. We'll also look at Global Impact, which won't.

Twitterrific had fallen behind in the Twitter app wars, but this newly released version is a design masterpiece that makes Twitter fun and easy to use.

New version just went live and might make you question your Twitter app of choice.