Don't worry, it's not even close to Sony's fail which btw isn't even over. Microsoft is just having some issues with the Live Marketplace and their looking into it. Well that's what we all know so far. When going to sub-sections like Games on demand, you're greeted with "No Content Available."
No official statement from Microsoft about the cause of the issue but has mentioned that their working to get everything up and running as soon as possible.
“Users may experience difficulties with the following services: Browsing Indie Games from the Xbox 360 console or Xbox.com, browsing the Games for Windows – LIVE Marketplace on a PC, Browsing Games Marketplace from the Xbox 360 console or Xbox.com,”
“We are aware of the problem and are working to resolve the issue. We apologize for any inconvenience this may cause and thank you for your patience.”
Guys, don't freak out all of a sudden, like i said, it's not like Sony's outage. It's only the Live Marketplace having problems, you can still play online ad access your friends list. I'm sure most of you won't be affected by this issue since your all too busy going at it in either Halo Reach, Black Ops or some multiplayer game, still, lets hope it's nothing serious and will be resolved soon.