Microsoft Surface is a technology that I know exists but wish it was a larger part of my life. And it's getting better! Microsoft Research has been dabbling with Surface and adding new gestures that incorporate your whole hand, giving you more options than just point, point, point.
Soon, you'll be able to control Android phones with a front facing camera through hand gestures. Brush left and right to move through photos, wave up and down to scroll through web pages, it's a non-touchscreen from the future.