Apple have today released an updated version of the iPhone SDK, the package necessary for developers to code sanctioned third-party applications for the cellphone (and its iPod Touch PMP counterpart). Beta 2 is primarily notable for adding Interface Builder, the drag'n'drop GUI development tool which allows, as its name suggests, coders to put together interfaces for their software. According to the SDK readme file, the rest of the changes are generally tweaks in response to known issues, although there are still outstanding problems Apple are yet to address.

Aside from the Interface Builder, the SDK includes Xcode IDE, Instruments, iPhone simulator, frameworks and samples, compilers, and the Shark analysis tool.

[via Macworld]