Behold the Omnitouch: a device that is worn on one's shoulder and uses everyday surfaces as a gigantic touchscreen. The Omnitouch does this by using a projector to project a screen onto various surfaces, then it records and analyzes one's movements.
A fun result of this is the ability to use your own body as a touchscreen. You can call friends from your hand, play games on walls, watch television on your arm; the possibilities are endless. I think that the freedom from a little four inch screen is what sets the Omnitouch apart.
Why lug around a laptop when you can have the internet right on your shoulder? The small and lightweight Omnitouch is much easier to take with you than most traditional devices.
The creator of the Omnitouch, Chris Harrison, plans not to release the device for public consumption until he can reduce its size to roughly that of a pen.