In February 2006 I bought eMagin's 3DVisor head mounted display. The device offers stereoscopic imaging at SVGA resolution and has built in head tracking sensors.
Unfortunately, it doesn't provide any software support out of the box. I started implementing a set of utilities for the visor, mainly to provide head tracking in simulation games.
All of the utilities on this website are free. Some require additional software in order to run.
Any comments you have should go to eMagin's 3DVisor forum.
(c) kolbysoft 2006