>The wii remotes can do that, and in fact it would be fairly easy
>to tape a wii remote to a PTZ camera and control pan and tilt so
>the IR light is always in the center of the Wii sensor.  The zoom
>would be easier with two cameras (or a second wii remote) to do a
>little triangulation for depth.
>
> http://www.cs.cmu.edu/~johnny/projects/wii/
>
>Looks like Johnny Lee's next project is 3d tracking.  He keeps making

Hey, that is real clever. The 3D demonstration in the 3rd movie is really 
something. 

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