http://www.microsoft.com/surface/This is so cool I just had to blog about it. Take a minute to watch the videos, they are quite impressive.
Basically it's a 30 inch surface that is monitored by tiny wireless cameras. Hand gestures can rotate and resize images and videos and things. I don't think we're at a point where we can give up the keyboard or the mouse, but think of some of the other uses it would be good for.
In the videos they show a simple paint program that kids would enjoy. They also show it at a restaurant where the menu is all digital and you flip through it using your fingers. When you're ready to order, you just drag the item to the center. The same would go for paying the bill. Set your credit card on the table, split the checks up, calculate the tip, and charge the card all without waiting for a server to do it for you.
I think we're going to see some really cool uses for this thing outside of normal computing.