Multitouch screens are showing up quite a bit recently. The iPhone has one and various other devices do also. Multitouch allows input on a screen from more then 1 point. An example of this could be a large screen with several people getting information from the same screen, same interface, but all looking up what they want to do. On the iPhone the multitouch screen is used for zooming in and out of photographs and scrolling through various menus.
To see the extra control you get, check out the demonstration below. It shows the new level of interactivity between you and the screen.
Via: TurboRush