I did this a lazier way. First I installed Dapper on the computer (with an old monitor connected), attached the S-video to the TV, and while doing a reboot, I could see the computer booting on the TV
But the problem was, when X started, the resolution got too high for the TV. Simply unplugging the monitor solved that (After a reboot).
I don't know about XUbuntu, but for me, it worked with Dapper with no configuration or messing with drivers. Impressive
To watch movies or play music I ssh to the computer and start mplayer from the command line.
I had to do two things for this to work:
login to Gnome with the same user account as the one I use with ssh.
I put the DISPLAY line in bash_profile so I don't have to type it after every logon. From the menus in Gnome, there was a way to set it so it logs in to Gnome automaticly on every boot.
And of course, I needed a cable for audio to my Stereo, which worked great too, with no configuration.
Only thing that didn't work out of the box was codecs. I installed Automatix, and got lots of codecs, fairly easy.
I don't know if I was just lucky? Anyway Ubuntu impressed me