Nintendo's Wii controller is pretty swell. You wave it around and the movement is translated into actions for whatever metaphor there is in the current game. Now take the controller away. Replace it with any random object or just a piece of tape on your finger. Take the Wii console away. Replace it with your normal computer and a cheap web cam. Viola. Nintendo is screwed.
And it's all thanks to a tiny startup in Israel. This works on any game. All it takes is someone to invent and bind a control scheme.
