It certainly opens up possibilities for alternate controllers and musical performance tools. What do you think?
UPDATE: So, the iPad it is. Kind of sounds like a feminine hygiene product. Anyway, it's a 10" touch sensitive screen based around the iPhone OS, which is itself a stripped down version of OSX. I'm definitely a big Apple fan, but I just don't know about this. Typing on a flat screen in particular seems like it would be really unpleasant. I'll reserve judgement until more comes out about it (not even a price announced as I type this), but so far I haven't seen anything about it that makes it a "must have".
UPDATED UPDATE: Apparently the price is around $500.