Called EMG, this technology tries to emancipate players’ hands from overusing physical control such as keystrokes. The system uses a series of connectors attached to an armband, The armband leverages Electromyography (EMG). As you can see in the video, this creates a system that translates the electrical activity found in our muscles into instructions for a computer. Or a Guitar Hero air guitar.
Video: http://news.mmosite.com/content/2010-01-05/new_technology_control_your_game_using_your_muscles.shtml
The fatal weakness is tooo much wired. That would be fun if wireless.
pretty cool. but project Natal can do that too.