I have attached the arduino code files.
The system responds very quickly, even to fast, small movements. Now, we can use the Wii camera directly in all our projects. Look for cheap busted Wii remotes on ebay to salvage.
If you are getting too much noise in the system (i.e. the camera is seeing too many extraneous light sources) you can use the IR filter from the Wii remote. This will filter the lights which are disrupting the camera.