This is the most amazing touch screen system I have ever seen. Watch the video to see it in action
this is an older video
[youtube QKh1Rv0PlOQ]
check out how he moves the photos around with two fingers to rotate etc.
You can also go here for a good back story on the inventor, Jefferson Han, from the magazine Fast Company
They have a newer video of a bigger screen with two users. Unfotunately you have to watch an advertisement. If anyone can find this video somewhere else please comment.