Yeah! Lots more games have shown up on the 360 backwards compatibility list: Xbox.com | Xbox 360 - Original Xbox Games on Xbox 360.

Including something that surprised and delighted me to no end:

Buffy the Vampire Slayer

Yes, I wear my Buffy geekdom on my sleeve quite proudly. I recently had started playing "Chaos Bleeds" again. I'm really looking forward to playing the orignal Buffy again... except for that whole "no save points" thing... and that hard ass level of fighting the evil Buffy. Well, it was still loads of fun!

"Fade to black..."

Also: Psychonauts is supported now, which I think I'll need to try and track down a used copy of.