Emotiv systems human computer interface. Detects facial expressions, mouth, hand and eye movement. Gyro system tracks head movement. All wireless.
Holy shit, if this doesn't turn out to be a flop I don't care what it's gonna cost, I'm getting one.
http://emotiv.com/INDS_2/inds_2_1.html
EDIT:
Damn they are already demoing it live.
Cost 299$
Yep, saving up begins now. 
