I knew about the R.U.S.E game but I didn't realise that they integrated it with the Microsoft touch screen tech.
I thought the trailer was a nice special effect but it really works.
I don't think you can do multi-touch with OIS. But it should be possible with the Windows 7 multi-touch API (which will be similar to the Surface SDK I heard).
Wow, I've seen tons of Surfaces, but never seen that game. Pretty amazing, looks like MS has lots of cool things popping up in the entertainment department.