http://www.engadget.com/2010/11/25/movea-turns-your-ipod-touch-or-iphone-into-an-air-mouse-for-just/
Not so keen on plopping down a Benjamin for Movea's Air Mouse? A full two years after the introduction of that very product, there's now an acceptable, bargain-bin alternative: the Air Mouse. Er, the Air Mouse app for iPod touch / iPhone. This here nugget of code, which is selling for just $1.99 in the App Store, taps into your iDevice's inbuilt gyroscopes as well as the company's own MotionSense technology in order to convert your handheld into a mouse. No need to fish for a surface, though -- simply wave your iPhone around in order to take advantage of in-air cursor control and gesture recog
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