Extreme Reality (XTR3D) is demonstrating its new touch-free gesture control interface for laptops at this year's GDC. The "iZi" (pronounced 'easy') allows gamers to easily control PC games and applications using body gestures and/or movement.
Kinect has already been hacked to do this. There's also a great brick type game on the Mac app store where you use your hands as controls via the isight camera. I love this technology!
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