Updatedx3: Urgent maintenance complete
Blizzard has announced that they are conducting urgent maintenance on several realms. Though the official Warcraft twitter account announced it would only go on until noon PST (the tweet was about account maintenance), the in-game and forum messages state that they do not know how long the maintenance will take. They expect to have more information by 12:30 p.m. PST / 3:30 p.m. EST.
The list of affected realms is after the break (which includes Zangarmarsh, the It came from the Blog server).
We will keep you informed as the status changes.
3:25 p.m. PST: All realms are (supposedly) online and playable.
Update 3 p.m. PST:More info at 3:30 PST.
Update:More info at 1:30 p.m. PST.
Aerie Peak
Altar of Storms
Alterac Mountains
Andorhal
Anetheron
Anvilmar
Archimonde
Area 52
Arygos
Auchindoun
Azuremyst
Black Dragonflight
Blackwing Lair
Blade's Edge
Blood Furnace
Coilfang
Dalaran
Dalvengyr
Dawnbringer
Deathwing
Demon Soul
Dentarg
Doomhammer
Duskwood
Executus
Exodar
Fizzcrank
Galakrond
Ghostlands
Gnomeregan
Grizzly Hills
Haomarush
Icecrown
Jaedenar
Kel'Thuzad
Khadgar
Lethon
Mal'Ganis
Norgannon
Onyxia
Scilla
Sentinels
Shattered Halls
Steamwheedle Cartel
Tanaris
Terokkar
The Scryers
The Underbog
The Venture Co
Thrall
Turalyon
Uldaman
Undermine
Velen
Ysera
Ysondre
Zangarmarsh
Zuluhed