"Emotiv Systems has developed a new interface for human computer interaction. Project Epoc is basically a beautifully designed EEG system that connects wirelessly with all game platforms from consoles to PCs. Neurosky is another developer of sexy brain sensorware that collects brainwave signals, eye movements, and other bio-signals which are captured and amplified via their patented dry-active sensor technology. While NeuroSky's headset has one electrode, Emotiv Systems has developed a gel-free headset with 18 sensors. Besides monitoring basic changes in mood and focus, Emotiv's bulkier headset detects brain waves indicating smiles, blinks, laughter, even conscious thoughts and unconscious emotions. Players can kick or punch their video game opponent - without a joystick or mouse."
The commercial version supposedly comes out in 2008.
Check out their website for the PR video.