What about other programs that save there that are only tangentially documents. I'm thinking of things like saved game files which can often be upwards of 500MB

What about other programs that save there that are only tangentially documents. I'm thinking of things like saved game files which can often be upwards of 500MB and depending on the size of SkyDrive could fill it up quickly leading to documents not syncing. Or if some files (such as saved games) don't transfer that sounds like a recipe for user confusion.