Thanks, everyone, for the great replies. I am very excited about the Xbox now. I still have one component video input and one optical audio input free in my teevee system, so it looks like everything will be jake.
I have one additional question that won't make a difference either way, but...when I wired my house network, I never thought I'd need a network port near the TV (yeah, I know...), and actually put one instead on the other side of the room.
She Who Must Be Obeyed would never let me run a line from the TV across the room, so I'm probably going to have to get a 54g wireless bridge that will connect the Xbox to my 54g wireless access point.
Will that be fast enough to stream Divx:) movies from one of my computers to the Xbox?
Thanks again for any brainpower.