You can now do head tracking with the wii remote.
Head Tracking for Desktop VR Displays using the Wii Remote
Using the infrared camera in the Wii remote and a head mounted sensor bar (two IR LEDs), you can accurately track the location of your head and render view dependent images on the screen. This effectively transforms your display into a portal to a virtual environment. The display properly reacts to head and body movement as if it were a real window creating a realistic illusion of depth and space.
[youtube=425,350]Jd3-eiid-Uw[/youtube]
Links:
http://www.youtube.com/watch?v=Jd3-eiid-Uw (Can't hyperlink because it just brings up the video, MOD please fix)
http://www.cs.cmu.edu/~johnny/projects/wii/Discuss