Chris Remo from Gamasutra writes:
"Xbox 360's fall dashboard update is due August 11, Microsoft said today, and amongst its inclusions is Xbox Live Games on Demand, the digital distribution service Microsoft announced during E3.
Initially, the service will allow gamers to buy and download more than 30 games, including Mass Effect, BioShock, Assassin's Creed, and Lego Star Wars. Microsoft claims additional games will be added on a weekly basis.
In addition to its availability via Xbox Live Marketplace, successful animated series South Park will also be represented on Xbox Live Arcade by way of the upcoming game South Park Let's Go Tower Defense Play."