Apple on Thursday released an update for the iPhone SDK, bringing the current version of the SDK to 3.1.2.

The new SDK 3.1.2, which now includes Xcode 3.2.1, is available in versions that are compatible with Leopard and Snow Leopard for iPhone and iPod Touch developers.

The update contains general bug fixes for the SDK and Xcode. Dashcode is reported to now support the creation of Web applications that are optimized for Safari on the iPhone, PC, and Mac.

If you’ve used this new update, please tell us about your experiences with it in the comments.

I learned the hard way that disconnecting my iPod Nano while it was still connect to Mac would freeze it. If you ever face a frozen iPod Nano, you need to toggle the ‘hold’ switch on and off to ‘lock’ then ‘unlock’ the iPod controls, then press the ‘Menu’ and ‘Select’ (centre) buttons for about 10 seconds until the Apple logo appears and your iPod Nano restarts.