I just saw a video that blew my mind. At NYU they've developed a touch screen similar to the one featured on the iPhone...only much larger. Jeff Han demonstrates it's possibilities in this video.
Interfaces like this will be a huge leap forward in how we interact with computers.
Jeff Han is a research scientist for New York University's Courant Institute of Mathematical Sciences. Here, he demonstrates—for the first time publicly—his intuitive, "interface-free," touch-driven computer screen, which can be manipulated intuitively with the fingertips, and responds to varying levels of pressure.