Leap Motion impressed attendees by enabling people to throw away the mouse and control computers with natural hand gestures, allowing users to literally mold their ideas on the screen.
The main control surface is wide enough, in fact, that we could comfortably put three fingers on the top of the mouse, using the middle to control the mouse wheel and DPI sensitivity adjustment rocker (a nice touch in and of itself) without ever moving our index and ring finger from the all-important trigger buttons.