Christopher Breen, Macworld.com:
In the grand scheme of things, the Apple TV is neither source nor destination.
It’s a portal.
Bingo. Breen alludes to the one feature that was reason enough for me to buy the Apple TV - AirPlay.
The point being, once you see the Apple TV for what it is—an accessory rather than The Thing Itself—it makes sense in Apple’s larger plan. You bring the content, we’ll provide the ways to move it where you want it.