THanks to EventHubs for posting this:
http://www.eventhubs.com/news/2010/mar/08/sf4-brawler-pack-free-charge-xbox-live/
You can get the alternate costume pack named Brawler Pack;
Costumes for: Abel, El Fuerte, E. Honda, Rufus and Zangief.
IT only works through the Xbox Live website and...