Lightglove

Lightglove is a new human interface device that falls into the category of
virtual controller. It is worn as a cuff on the underside of the wrist.  The
light scans the palm area of the hand and when a finger is sensed in the
light beams, it pushes a "light button". The device also senses hand motion
for on-screen navigation. This allows the user to "air type", web surf or
play a game while using the visual feedback from their monitor or PDA. 

In addition, the Lightglove can be used as an X-10 controller to allow
individuals with restricted mobility to turn their electronics off and on
with a minimum amount of effort. This device is a "no impact" input
mechanism. As an assistive technology, the Lightglove can also be used as an
infrared remote control to activate special access doors without having to
push a mechanical button. 

Link:
http://www.lightglove.com