Check out this 5-minute TED presentation by Johnny Lee on using a Wii Remote with a Bluetooth-enabled PC, simple IR LED, and video projector to create a simple video whiteboard, hand/motion tracker or touchscreen system:
Seems like a good match for digital globes like Google Earth and WorldWind, or for some GIS display systems. There’s more information, including software and source code downloads, at Johnny Lee’s website, and more information is also available at the WiimoteProject forums.
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