I have a possibly very reliable headtracking idea.
Mount a camera or even better kinect on your hmd. If you identify a point in space you can - when the camera moves - identify the position the user is in. Using the kinect you could actually detect forward and backward movement, so you get a headtracker.
I am sure this has been done.
Do you know more?
Kinect headtracker
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Re: Kinect headtracker
See the PTAMM / Visual Odometry thread for work along these lines. Kinect cameras run at 30 FPS which is considered a bit slowly (but workable).
http://www.mtbs3d.com/phpBB/viewtopic.php?f=138&t=15312
http://www.mtbs3d.com/phpBB/viewtopic.php?f=138&t=15312