Hey, just found out about freetrack, pretty cool. I was thinking about getting Trackir for a second, haha. Anyway, ive been looking into HMD's (head-mounted-displays) in use along with 6DOF head-tracking software. The VR920 (http://vuzix.com/iwear/products_vr920.html - OR
http://www.youtube.com/watch?v=9ZABh01HVIM) already has 3DOF, but thats not enough for me :D. The VR920 was made for gaming, so when you look actually look behind ur shoulder, its displays in the game, etc. (jus watch the vid). I havent gotten either the software or the goggles, but I plan on it. I was wondering if anybody had already tried that, or if they were willing to try it, a let me know how it goes :D! Thanks for reading!