GUI's on your skin, that's 'Skinput' as developed by Chris Harrison at Carnegie Mellon. I heard about it before but only now I found some interesting visual material actually showing how Skinput is used. It works with an armband that through a picoprojector shines a display on the user's forearm or hand, and it senses where the user taps through acoustic vibrations within the body. Finger gestures like pinching can also be sensed for special actions.
This is definitely going to the ultimate seamless wearable technology, where the body becomes the technological medium. To see Skinput for yourself, get your body over to CHI2010, April 10-15 in Atlanta, Georgia.
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