In the meantime, enter to win some real life and in-game loot. Or log on to Zangarmarsh and join the WoW.com guild so you can party with us on Wednesday night.
If you are unsure what battlegroup you are in, please consult this listing.
Battlegroup listings are after the break.
Update 1:16am: Zarhym says the problems were due to a complete power failure. The power is back on and they are trying to bring the realms up now. The party is still raging on Zangarmarsh.
Update 11:37pm: They have discovered the source of the battlegroup issues, but still no estimate for when they will be back up. We're having an impromptu party on Zangarmarsh if you would like to join us.
Update 11:12pm: I was just able to login. No word yet on the down battlegroups.
Update 10:56pm: An official response: they are working on it.
Update 10:49pm: Many, including me, are having connection issues. There is a huge forum post on the issue, but no blue response yet.