Skinput Body Interface Listens for Taps on Skin

CNN Labs (?) runs a story about Skinput, a prototype interface that appropriates the human body as input device, developed by a Carnegie Melon grad student and Microsoft researcher. "Skinput can tell whether a person tapped a middle finger or an index finger, because the two moves sound slightly different to the springy receivers."

Related:  some other work in this area as well as the now-famous Sixth Sense prototype from MIT.