There has been a lot of enthusiasm in Techie/Hacker communities lately about Sony’s Kinect device. The Kinect used a series of cameras to track figures in a room, turning people’s bodies into video game controllers. So instead of pressing a button on a controller to kick a soccer ball in a game, you simply kick your foot and the game responds. Sony has had mixed feelings about people ripping open their hardware and using it for their own uses, but recently they have been more open to the idea. Most of the modified uses of the hardware use custom software, and are not reliant on the Playstation 3, as was the initial intent. Here is one of the more entertaining examples of this technology being put to use.
Check out http://kinecthacks.net/for some more examples.