iPhone 3.1.3 SDK now available

Along with a new firmware for iPhone and iPod Touch Apple released a new version of SDK - 3.1.3. It's a required update, otherwise Xcode will not recognize or work with your 3.1.3 device. You can download it at iPhone dev center.

As usual the iPhone SDK includes Xcode, the iPhone simulator, and other tools for developing applications for iPhone and iPod Touch. If you want to develop for the iPad, you'll need the SDK version 3.2 instead.