Can you imagine holding your arms in the air all day long using a computer....
People, there is a reason the mouse was picked over other technologies as the main interface device. It's comfortable to use for long periods of time your arm is just resting on a desk.
Check this site out. Watch the video at the bottom. Pretty freakin cool!.. I definately want one
They call it 'multi-touch' and the manipulations are just like the iPhone. I hope maddog licensed that stuff!