A very very cool reason to actually look goofy in front of your computer!
http://www.youtube.com/watch?v=Jd3-eiid-Uw

Yes, this is very cool.

Developers, give me a game based on this pronto!

That looks pretty awesome. I would buy a game that could incorporate this.

That would be so awesome for Call of Duty 4. :D

Imagine ducking and finally actually hiding from gunfire!

Headtracking has actually existed for years now, and is pretty much a must-have for any devoted flight simmer. Look up the NaturalPoint TrackIR.

My dad had a colleague at work in the late 80's ( He has told me about this) that had something like this. So its not something new, but definitely cool. Although I dont imagine having the equivalent of carpal tunnel in the neck would be loads of fun.

Damn! That looks so cool - I want to see some games with that application.

Not that Civilization-series would benefit from it a lot.