Why does sitting in front of the computer have to be so uncomfortable?
This is an illustration I did. It's an idea by Peter Mucha of Steal My Ideas Please.com. (Love that guy.)
They say that it's better for your posture or something if you sit on one of those exercise balls. Well, why not have the whole ball be a track ball? You lean slightly one way or the other, and the mouse moves across the screen.
It could be shaped more like a chair, even. A big bouncy inflatable chair. With arm rests, and the keyboard built into the arm rests. Yeah! And just imagine the game applications: Airplane, car... something involving bouncing or balance.
Electronics are going to start getting more smooth around the edges. In the past, things had to be all x - y axis. Now technology can be more squishy-bendy.