This just in from the Official Site:

Emergency Maintenance for Station login and Launch Pad on December 1, 2006 at 10 AM PST (11 AM MST, 12 Noon CST, 1 PM EST, -8 GMT). The estimated downtime is one hour. We apologize for the short notice on this downtime. This will affect your ability to log into all games, and forums, accounts and billing will also be inaccessible during this hour. We thank you for your patience.

You can view this news post here.