How It Works: Microsoft's Project Natal for the Xbox 360 video from Scientific American
Microsoft gathered a wealth of biometric data to recognize the range of human movement in order to develop an algorithm for the next generation of controller-less gaming. "Natal will consist of a depth sensor that uses infrared signals to create a digital 3-D model of a player's body as it moves, a video camera that can pick up fine details such as facial expressions, and a microphone that can identify and locate individual voices."
The technology behind Natal has the potential for a range of uses beyond gaming.
Scientific American article:
Binary Body Double: Microsoft Reveals the Science Behind Project Natal for Xbox 360