Presumably the framework is stored on the HDD (if the user has one), so what are your plans regarding the practical support of the XNA framework for XBLA and retail? I doubt anyone would want to write a game for either of these channels that required the user to own a HDD, so how is the framework going to be packaged? For instance, the framework seems ideally suited to XBLA games, but presumably is far too large to add to each game download?