Well xbox's Natal project get it's answer from Nintendo Wii with the help of Ubisoft camera that brings new motion control : "Your ShApe" youtube video A camera connected in USB slot! Cool, what about to make a new Hombrew like the USB-loader, that could get data from a connected usb-camera and translate this data onto the wii! Just like Shape recognition (circle/square/triangle drawn on piece of paper, which is shown to the video camera! ) I'm sure We/Wii have hier (on this awsome big dev-site... ) very talented & skilled coders who would take & hit this very exciting challenge: making a USB-BodyMotion ! To start hier here, i found this OpenCV library: OPENCV * Open source computer vision library in C/C++. * Optimized and intended for real-time applications. * OS/hardware/window-manager independent. * Generic image/video loading, saving, and acquisition. * Both low and high level API. * Provides interface to Intel's Integrated Performance Primitives (IPP) with processor specific optimization (Intel processors).