The other day I saw one of those HP all in one, touch screen systems that have been recently advertised in many magazines, dont' know the model, don't really care. Anyhow, it was pretty neat, just walking up and being up to touch the screen to pull up a website or email and maybe even play a light hearted game.
I could see Apple doing something like that. Having the iPhone I was "at home" on the touch screen - so it was pretty neat. But, as a work computer or my primary workstation I would not use the tocuh screen that much, I don't think... but one in the kitchen or family room for the kids/wife might be good.