If you are a game developer, a gamer or just interested in new technology (I guess that covers 99% of our readers :-)), you may want to read this article: Binary Body Double: Microsoft Reveals the Science Behind Project Natal for Xbox 360.
Soon we will be playing games without using any controller. In fact, you become the controller, the Xbox 360 will respond to your movements and your voice. If you want to see how that works, have a look here.