Hmm, forgot about this topic.
Did anyone manage to get this working in the end? I've been looking at doing a similar thing in my project, but I don't want to re-invent the wheel so to speak!
I'm upping this post, because I would really like to know if anyone managed to create a working head tracking with OGRE.
I'm bit late, but better than nothing.
After playing with the wiimote stuff like I mentioned back in 2007 in the beginning of the thread and showing it off in class, some of my students in 2008 decided to make a game with it. Time Crisis style rail shooter using ogre, a projector, wiimote to shoot, another wiimote for head tracking and ir led headset. You physically dodge incoming fire using full body motion.
(The view in the game is scripted at various points like when moving forward, so sometimes the video doesn't seem to respond to the player's movement).
It worked really well. Kinect would be better (so no head mounted ir lights), but we didn't have one 3 years ago.
I'd still want wiimotes for aim though.
I don't have the source code, so can't give anything out.