D&D for the Surface
news.cnet.com
news.cnet.com
For people who want to emphasize storytelling and role-playing, I recommend checking out Burning Wheel:
http://www.burningwheel.org/?page_id=2
That's not to say you can't do good collaborative storytelling etc. in d20, but Burning Wheel has explicit structures & rewards for doing so.
The Storyteller System used by White Wolf for the old World Of Darkness series struck me as a very good balance between the two, back before children and grad school essentially put an end to my playing.
And to keep this remotely topical, I think Scrabble and then 1-6 player Risk would be great also since I'm seriously addicted to playing Lux on my iPhone...
Any guesses as to how far we are off for these sorts of things? I'd love to see a line of Surface machines on the market and an app store for them.
That said, interesting interface for the game. Seems like it'd be well suited to Warhammer too, given the firing maps & rather complex rules at times. A graphical overview could really enhance strategy.