THIS is cool!
The LEAP system is a small peripheral device that sits in front of your keyboard, creating a 3-dimensional space above it where any motion of your hands and arms will be monitored. Those motions will be translated into control movements for various applications. For those of you with Xbox Kinect, this is a very similar effect using (apparently) a different technology.
There are, of course, tasks for which a mouse and keyboard are better suited and those 2 interface devices are likely not going away any time soon. But this offers very interesting possibilities!