Something must be fishy with the Xbox 360 December backward compatibility update for Microsoft to update their list online and quickly take it off again. However, in that short period of time people got these old games working:
* 31 NEW titles: New Games: Buffy the Vampire Slayer, Dead Or Alive Ultimate, Destroy All Humans!, Dynasty Warriors 4 / Shin Sangokumuso3, Evil Dead: A Fistful of Boomstick, Fahrenheit/Indigo Prophecy, Family Guy, Far Cry: Instincts, Incredibles/ Mr. Incredible, I-Ninja, Leisure Suit Larry: Magna Cum Laude, Mortal Kombat: Armageddon, MotoGP, Open Season, Pariah, Psychonauts, Rainbow Six: Lockdown, Rapala Pro Fishing, Scarface, Shark Tale, Shenmue II, Splinter Cell: Double Agent, The SpongeBob SquarePants Movie, Ultimate Spider-Man, Wakeboarding Unleashed: Featuring Sean Murray, Whacked!, Winback 2: Project Poseidon, Xiaolin Showdown
* 1 UPDATED title: Burnout 3: Takedown
No word on when the update is coming.