Login server issues this evening
Many players are getting login server errors when trying to get into the live servers, the beta servers or when attempting to pre-order their copies of Cataclysm. Blizzard says that it is a known issue.
We'll keep you up to date with any developments.
Update 8:45 p.m. EDT: Many are reporting that the login servers are working again, however Battle.net is down for maintenance.
[Thanks to everyone who sent this tip in!]