The LightGlove ‘attaches like a large watch underneath the wrist and senses finger position and hand motion to create pointing input for virtually ANY electronic device…A light beam illuminates a column for each finger, and a reflection is detected when a finger is lowered into the beam to “press a key”.’

A sort of virtual glove controller without the glove. The idea of holding fingers in particular, non-intuitive positions sounds a tad painful to me though, I must say.