Yesterday, Apple released the fourth beta version of iOS 5, which was available to download "over-the-air." However, a recent Twitter update by iPhone Dev-Team member @MuscleNerd notes that these OTA updates are currently not compatible with jailbroken iOS devices. He notes that the limitation is "almost like a present from Apple."

Following months of speculation, it would appear that Apple is indeed planning on launching a Siri-like system navigation feature with iOS 5. The feature, called "Assistant," is expected integrate seamlessly within the iOS, and work alongside contacts, location and other aspects of the mobile operating system.

Apple has just released iOS 5 beta 4 for developers and, for the first time, it includes over the air (OTA) updates. The updates are available now for download.

Some good news for those still sporting the iPhone 3GS. As you know, with iOS 5 you'll probably have to forfeit some of the new features because of your older hardware, but it seems like photo editing won't be one of those.

After a one-year absence, Apple is expected to announce a 2011 edition of its “iOS Tech Talk World Tour,” according to Japanese blog Macotakara. Assuming this rumor is correct, it would come just as the company releases iOS 5 and all of the features of iCloud.

Apple has tweaked the Notification Center gesture in iOS 5 beta 3. Now, when users are in a full-screen iOS app, a swipe-down from the top of the iPhone's screen will instead reveal a "hook," instead of revealing Notification Center in full. If you want to access Notification Center, simply drag down on the hook once it appears.

Here's a great, new feature discovered in the latest beta version of iOS 5: When making FaceTime calls, it's possible to stream the video to an Apple TV via AirPlay, and make the call using a "big screen."

Great news, jailbreak fans: The latest beta version of iOS 5 (beta 3, which was released yesterday) can already be jailbroken using the iPhone Dev-Team's redsn0w. While a previous version of the app didn't quite work, the Dev-Team updated redsn0w (0.9.8b2) and the jailbreak now works perfectly.

The upcoming fifth iteration of iOS will arrive with a lot of interface improvements. The most notable is, without a doubt, Notification Center, which allows you to access everything that's happening from your apps in one place without ever being interrupted. Yet, there is still room left for Apple to improve.

According to some iOS 5 SDK discoveries, Apple might be preparing to push the envelop in mobile Safari with support for a download manager, and even extensions.

If you're looking for an SBSettings style widget for Notification Center, consider downloading OmniStat. The handy widget allows users to quickly tweak their iPhone's settings, and also features details statistics on the handset's performance.

Many app developers will make some big changes once iOS 5 is released this fall. Apple has yet again added functionality that was, until now, only obtainable through third party apps. The developers will need to pack in more advanced features or else come out with new apps. We walk you through some of the apps endangered by iOS 5 in this AppList.

Are you in search of a good reminder app? iOS 5 will come with a built-in reminder app, but perhaps you can't wait until then. Or, you are using iOS 5's Reminders, but you want an alternative that is just as simplistic and easy to use. What is the right to do app for you? We take a look at the to do apps that compete with Reminders in this AppGuide.

Can't wait to try the new notification center? Anxious to be reminded to empty your work fridge before you leave work? Want to iMessage all your buddies who have installed iOS 5 beta 2 already? Read on for instructions on how to get started.

According to a recent article, once the final version of iOS 5 becomes available a jailbreak tweak will be released, which will allow users to tweet from anywhere within the iOS.

Joshua Topolsky coined the term "continuous client." You might know it better as "iCloud."

Jailbreaking isn't for everyone, some people prefer not to bog down their devices with all sorts of experimental tweaks, so today I am going to show you how you can view your favorite RSS feeds directly in Notification Center without having to jailbreak.

For just $100, you too can become an iOS developer and begin downloading and installing beta software. Regretfully, it appears that many of these “developers” haven’t read the fine print and as such are beginning to bash iOS 5 and Apple. Is this justified? Absolutely not.

We already know that you can now use your iDevice while syncing with iTunes in iOS 5. Just moments ago, we were tipped off by a developer about an interesting new tidbit in the iOS 5 beta; you now can view apps being installed in real-time while the sync takes place with iTunes.

In the latest beta version of iOS 5, Apple has blocked Applenberry's Gevey SIM unlock, a hardware-based unlock solution for the iPhone.

Apple may be the in process of making it more difficult for users to jailbreak their iDevices. Beginning with iOS 5, Cupertino is said to be adding an additional layer of security that kicks in when a user attempts to restore to a previous firmware version using SHSH blobs, according to the DEV-TEAM BLOG.

Good news for those who travel a lot, iOS 5's over-the-air update feature will work over your carrier's 3G network, not just Wi-Fi. That means easy and PC-free updates, wherever you are.

The new iOS 5 beta 2 was released quite unexpectedly this Friday. As always Apple left it to the the Web to uncover the change-log despite the NDA. Lots of our readers were kind enough to tip us off to a comprehensive list of new features the build added.