So if you've tried to download anything recently through your 360, you've already discovered that something is amiss in the world of Xbox Live. Several people have reported getting the error message "Can't retrieve information from Xbox Live. Please try again later. Status code: 807b01f7" when trying to download content. The problem seems to be specific to the Marketplace though, multiplayer and friends lists seem to still be working fine.
Probably just some server hiccups, but Joystiq will keep an eye on it and let you know when the situation improves.