By and large one of the greatest inventions I've ever heard...don't know why it hasn't been done yet! I mean, they've had stuff like this on corporate-end mega-printers for a while, making an elegant solution WITH APPS would be freakin' epic...It'll probably be WebOS-based if it's HP (time to start enacting that IP they just purchased!).
Seriously epic idea. I hate having to turn my computer on just to print off directions or movie tickets or the like. Think about it...a google docs app, a Fandango movie tickets app, an app that interfaces with my really nice HP camera... no need for a computer to serve printing anymore! Seriously...i'm ultra-excited just thinking about it ^.^