Finally, the game I've been waiting for ages to be compatible to the Xbox 360 has made the list...
http://www.majornelson.com/archive/2007/04/19/april-07-back-compat-update.aspx
Oddworld: Munch's Oddysee is easily one of my most favorite platform games of all time.
"There's my buddy. [fart noise]"
It's been ages since we've played Oddworld, but oddly enough, the one thing I recall about the game is the farting.
It's a guy thing, I guess.
I don't know about Munch, but in Stubbs The Zombie, farts of death were quite literal. You controlled a zombie and one of the most powerful weapons you developed as the game went on was a fart.
Also back-compatible, BTW, and quite a bit of fun if you spot it in a bargain bin.