Here's another random question: what's the difference between the new "AirPlay" and the old tried and true "AirTunes"? So far as I can tell, both are designed to let you stream your possibly-protected music to another device. I'm assuming that AirPlay = AirTunes + support for video streaming, and is thus backward compatible, but I wouldn't be surprised to find out I was wrong.

(And, when I'm streaming iTune Store-purchased video from my existing iTunes on my computer to my existing AppleTV, aren't I already doing what AirPlay is all about?)