You may recall that in order to run games for the original Xbox on Xbox 360, you will need the Xbox 360 hard disk and also special compatibility software provided by Microsoft for each game. The caveat was that the software wouldn’t be available for all the original Xbox games and, in fact, Microsoft was polling users about which games should be on the list. Well the results are in and the initial list of backward compatible games has been posted. Apparently, there will be more to come:
The folks at Xbox® are working hard to add more of your favorite games to this list, so check back often for the latest updates.
More details by viewing the Backward Compatibility Q&A.