Following the maintenance troubles of the past two days, Blizzard has created a new service status forum.
Here's the welcome post by Dalathmordus:
No tag for this post.This forum was created to bring you the latest information regarding the status of realms, transfers, name changes, and other vital game and account related services. Our goal is, as always, to maintain 24 hour working service, and your patience regarding any interruptions is greatly appreciated. Please refer to this forum frequently for available service updates and announcements.