The Leap Controller is a touch-free 3D controller that will become available this winter. It's on pre-order now for $69.99. Leap currently supports Windows and OSX, but Linux is 'on the agenda'.
From the Leap website:
Leap represents an entirely new way to interact with your computers. It’s more accurate than a mouse, as reliable as a keyboard and more sensitive than a touchscreen. For the first time, you can control a computer in three dimensions with your natural hand and finger movements.
This isn’t a game system that roughly maps your hand movements. The Leap technology is 200 times more accurate than anything else on the market — at any price point. Just about the size of a flash drive, the Leap can distinguish your individual fingers and track your movements down to a 1/100th of a millimeter.
This is like day one of the mouse. Except, no one needs an instruction manual for their hands.
What do you think? Can you see yourself working with a setup like this for a longer period of time? Or will your arms fall off?