Thats amazing! I didn't think that was possible yet.
On what part, it shows the Microsoft Zune, like the mobiles interacting, knowing what it is.
I bet you, the Zune already has that technology built in to be used on this in reality.
Imagine you being able to draw on a table, unlike a tablet, that allows you to be a real artist with it.
Creating music with a keyboard on screen,
Editing music without having to touch a mouse, controlling volumes, etc and effects with the touch of a finger.
3D modelling by stretching and pulling
Thats just some possibilities I thought of