Using the reacTIVision software toolkit (http://reactivision.sourceforge.net/), a Mac mini,a projector, a piece of perspex and a table from Ikea we produced an extensible framework from which the university could add new applications.
The following Youtube links show the table being used as a paint application , and also a simple checkers game.
Paintable - Multitouch interaction:
Paintable - Checkers game:
Not perfect but the concept is there! Oh and before anyone comments about it I do know that my .NET blog's first proper post contains Java and no .NET at all!