Multitouch is a cool technology that allows you to use gestures on a screen with two fingers. It has made ipod/iphone touch much more interesting and fun (Play with mine daily). As the technology becomes more popular it will become cheaper and cheaper. 

I have often imagined what it would be like to use Second Life with a huge Multi Touch screen. The video below looks like they still need to do some work to make the gestures more natural, but it does start to give you the idea of what it would be like. Wow this would be fun.