Xbox Live Marketplace adds HD & SD content from ABC, MGM

While HD DVD and Blu-ray have both lost key supporters recently, Microsoft's Xbox Live Marketplace seems to just keep adding new content providers, this time bringing MGM and Disney-ABC Television Group to the fold. Conspicuous in that bothare exclusive Blu-ray supporters, Xbox 360 owners will -- later this month -- have access to ABC hits like Lost, Grey's Anatomy and Desperate Housewives in HD the day after they air. So far, MGM's announced just classic and catalog flicks like the Rocky series and The Usual Suspects, with "most" available in HD. Still looking for a Blu-ray add-on or built in HD DVD?