I'd love to give an unbiased review of SpacePoint, PNI's 9-axis motion tracker module for games, but I can't. At CES they were demoing their motion tracking module with a gun controller and a first person shooter custom game. They put that controller in my hands, and as I leaned forward, my avatar moved forward. As I leaned backward, my avatar moved backward. The pointing technology was accurate, and very responsive. I was in love almost immediately.
See, their pointer technology is the most accurate I've experienced for a pointer controller. I could point the controller in an intuitive manner, and it aimed at and hit the right targets with little drift. Given a bit more practice, I doubt there would be any drift at all, a hypothesis I’m more than willing to test out (was that too strong of a hint?).
But this is basically tech that anyone will be able to pick up and use accurately. Their demo included a gun controller with a joystick next to the trigger to make looking around within the game environment super easy and intuitive. Forward and backward movements are done by slightly leaning forward or backward, something that anyone could easily take to.
I can see something like this being very popular with friends who want to play Halo together, and I hope someone in the future makes a controller like this that could work with Tribes (a flying game).