to take a screen schot with your ipod touch you have to have 2.0 firmwire. to do it you hold the home key and the sleep button at the same time untill you see the screen flash.

Make sure you don't hold them both down for long.

Yes this a very neat trick! Here are a few more...

Tap the bottom right or left (about a cm up) to scroll though your apps instead of swiping.

In Google maps, double tap with 1 finger to zoom in, and tap once with 2 fingers to zoom out

For the complete list check out: List of useful iPod Touch Tricks - iPodTouchScene.com

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JailBreaking, Tricks, Free iPod Touch Wallpapers - all at iPodTouchScene.com