We will have a 15 minutes outage on the old Blogger 8-8:15 pm PDT today. Blogspot and the new Blogger (where the majority of our users are now) will not be affected, except users will not be able to create new blogs on new Blogger during the outage.
We apologize for the short notice।
Update (8:16 pm PDT): This outage was completed successfully.
Update (8:45 pm PDT): We're actually now dealing with some fallout from the outage. If your blogs are on new Blogger, you can login directly here.
Update (8:46 pm PDT): While I was typing it looks like the other guys got it all fixed. Old Blogger is back to normal.