Don't see what I'm wibbling about when I talk about how revolutionary finger-driven multi-touch displays are - and in particular why this could be such a big thing for the iPhone?
Go watch this. I've linked to the same chap before, but even the thumbnail demo video in the corner of this is a pretty good taster.
It is a wholly new and different way to interact with a computer, dramatically more natural and intuitive than a mouse, a stylus on a touch-sensitive screen or a Wacom-style graphics pad.