Yeah ive got an iphone, and am seriously impressed... I reckon its only a matter of time before touch becomes the standard interface. At the moment theres a few HP touch pc's, but theyr jus running vista, which was designed for a mouse, and so they seem clunky. The iphone is proof that when something is DESIGNED for touch, the result is beautiful and intuitive.
Iv managed to find a forum on this topic, where theyr building their own multi-touch screens and using flash to make programs for it, so rooting around there at the moment :)
http://nuigroup.com/
Like I said, I reckon this is the future, so Im kinda hoping to get ahead of the game :D