The device is called a PIP, or personal input pod. You hold it in your fingers (see picture), and it measures galvanic skin response (electrical resistance of the skin, an indication of stress levels).
Since this is a bluetooth enabled biofeedback device, it is compatible with any platform that supports bluetooth, though their initial offering of 3 games is only for cell phones and PDAs.
I'm definitely looking forward to this becoming available. If it's effective, it could open up the door to the masses learning to self soothe and calm in many more activities of life.