Steam down?

It is down.
forum thread

is down for me 2

They have maintenance atm probably and it happens a lot of times.... If they would get hacked you'd most likely still see the site up

As usual

Normal

40 years of darkness, Earthquakes, Volcanoes, The Dead rising from the graves,Human's Sacrifice, Dogs and Cats living together, Mass Hysteria!!!

Probably zombies.

According to Valve it was a failure in a power supply.
source

For more info check this out:
http://forums.steampowered.com/forums/showthread.php?t=784745&page=26

virginmobile.fr is down too. Maybe we are seeing the beginning of the zombie apocalypse.

Welcome to 2012 :/

"Update: Our data center's uninterruptible power supplies experienced a power failure. The power is back on now and we're working to get service restored as quickly as possible. We apologize for any inconvenience this may have caused."

lol, I love valve's sense of humour

No it's not. Steam is up for me