A new backward compatibility update is now available for the Xbox 360. You can see the complete updated list here.
Don’t have Xbox Live? Download the update to your PC here
New games:
BLACK”
Star Wars Battlefront” II
World Soccer Winning Eleven 9
Updated games:
Darkwatch”
Grand Theft Auto: San Andreas”
Half-Life 2
Fable
Fable: The Lost Chapters”
Forza Motorsport”
Ninja Gaiden
Ninja Gaiden Black
SSX 3
Tom Clancy’s Splinter Cell Chaos Theory”
kill.switch
World Series Baseball 2K3
Edit: Reminder: You need to play an original Xbox game on your Xbox 360 while connected to Xbox Live in order to get the update. More FAQ’s here.