Pico projector would absolutely RULE!!!!
My business would boom. Even if it only projected for 30 min, that's more then enough time to design a sales presentation, or a portfolio presentation, or show someone your website on a wall... man it would be crazy cool.
Imagine being able to present information anywhere, on any surface.
Lots of you have no imagination and are only thinking that it would suck to play movies on... but there are endless possibilities for something like this.
This is exactly the type of feature that would bring designers back to the Mac and show that Apple still cares about the publishing industry.