Someone can feel free to correct me if I'm wrong but I don't think the technology exists in a touchpad form yet. Because the pad would have to be able to recognize 10 simulatneous touches.

That said, it's not impossible. Look at this demo using Microsoft's WPF: http://codeclimber.net.nz/archive/2008/01/23/Minority-Report...

If you take what he's doing but mount the Wii remote under a desk with a clear screen above it. I believe that would give you what you'd need to duplicate the 10/GUI interface.