Shortly after 5.0.1 was released to address issues with battery problems, it was apparent that not only did 5.0.1 not fix the issues, it created more. We've all been waiting for the inevitable release of the next firmware to finally correct these issues and today Apple began seeding iOS 5.1 and XCode 4.3 to developers. Again, once this firmware is released publicly you will want to stay away from the update if you have an A4 device and would like an untethered jailbreak or if you are on an A5 device and you want to be able to jailbreak.

iOS SDK 5.1 provides support for developing iOS applications and includes the complete set of Xcode tools, compilers, and frameworks for creating applications for iOS and Mac OS X. These tools include the Xcode IDE and the Instruments analysis tool among many others.

With this software you can develop applications that run on iPhone, iPad, or iPod touch running iOS 5.1. You can also test your applications using the included iOS Simulator, which supports iOS 5.1. There are two Xcode iOS SDK 5.1 images, one for installing on a Macintosh computer running Mac OS X 10.6.7 (Snow Leopard) or later, the other for installing on a Macintosh computer running Mac OS X 10.7 (Lion).