What happened to your server today? Well if you play on one of the servers below, you will not be able to log on even after the regular maintenance hours. Blizzard posted this last night in their forums.

The following list of realms will be taken down tomorrow for a period of twenty-four hours starting at 5:00AM PDT. We realize that this is inconvenient; however, this downtime is necessary to address the recent issues adversely affecting performance for players on these realms. All World of Warcraft players on these realms will receive a one-day time extension for the downtime caused by this maintenance. All other realms will be brought back up at the normally scheduled time of 11:00AM. We thank you for your patience and understanding.

Alleria
Blackhand
Blackrock
Cenarius
Deathwing
Destromath
Dethecus
Doomhammer
Frostwolf
Garona
Gorgonnash
Hellscream
Hyjal
Icecrown
Illidan
Kel'Thuzad
Kilrogg
Kil'Jaeden
Lightbringer
Ner'zhul
Proudmoore
Silver Hand
Spinebreaker
Stormreaver
Sargeras
Tichondrius
Uther
Whisperwind