Shake the power!
I say! This kind of functionality probably was not on the minds of the prudent people over at Apple who were merely concerned with the detrimental effects that an over-exposure to gravitational forces might have on their good wares when dropped. But you can certainly trust the emo Apple crowd to come up with an MCUI (Motion Controlled User Interface) for iTunes! What's next - surfing the web in wave motions, the PB going wheeee when thrown around? At any rate, I want a new PB!