For those of you who have a 360 and some old XBOX games still lying around, here's a list of all the backward compatible titles added/updated:
Aggressive Inline
Aquaman: Battle of Atlantis
All Star Baseball 2003
All Star Baseball 2005
Burnout 3: Takedown
Catwoman
Crash Bandicoot: Nitro Kart UPDATED
Counter Strike
Call of Cthulhu: Dark Corners of the Earth
Dead to Rights
Digimon Rumble Arena 2 UPDATED
ESPN Major League Baseball
Fatal Frame 2
Ford vs. Chevy UPDATED
Freaky Flyers
Gauntlet: Seven Sorrows
Tom Clancy´s Ghost Recon - Island Thunder
Half Life 2 UPDATED
The Incredibles: Rise of the Underminer UPDATED
IndyCar Series 2005
Kabuki Warrior UPDATED
Lego Star Wars II
Links 2004
Magatama UPDATED
Maximum Chase
Mortal Kombat: Deception UPDATED
MTX: Mototrax Featuring Travis Pastrana
Namco Museum 50th Anniversary Arcade Collection
MX vs. ATV Unleashed
Outlaw Tennis
Over the Hedge
Sid Meier's Pirates
Richard Burns Rally
Rogue Trooper
Serious Sam
Shincho Mahjong
Smashing Drive
Sneakers UPDATED
Spy Hunter: Nowhere to Run
The Legend of Spyro: A Beginning
TAZ: Wanted
True Crime Streets of LA
The Suffering
Trigger Man
Torino Winter Olympics 2006
Vietcong
Wrath Unleashed
X-Men II: Wolverine's Revenge
For those Xbox 360 owners that do not have access to Xbox Live, you can download the update from Xbox.com.
I don't use any old games (truth be told I don't have many, wasn't keen on the original XBOX), but it's nice to see they're still working on it.