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There's already cheap technology to do this using a Wii remote camera attached to the screen and a pair of IR LEDS mounted on your glasses.

Those low resolution IR cameras must have been produced in such huge quantities I bet they are pretty cheap now. You can buy a Wii-mote for $50 retail and that includes lots of expensive hardware you don't need such as a bluetooth transceiver and a pair of accelerometers.

I mean without these "johnny chung lee wiimote goggles" :) It would be awesome doing the same using only webcam head-tracking.

Specifically: http://www.youtube.com/watch?v=Jd3-eiid-Uw

Check out his entire youtube channel, it is full of interesting software/hardware hacks.

Face trackers are pretty robust these days - the demo that comes with OpenCV is a great example, it just works without any configuration.

Build a 3d camera into the bezel?