I really love what's being done in the gesture technology space. Gaming has done some cool things starting with Wii and then leading into some of the cool features of Xbox Kinect. Then recently, Leap Motion came out with their computer addition. That said, this is probably the coolest iteration I've seen that could be sold for public consumption. Each of these MYO wristbands are available to pre-order for $149. You can learn more about MYO and Thalmic Labs by visiting their site here.
(ht to @kplanovsky for tipping me off to this tech)