There are problems with publishing to blogs. We are working on fixing this. Blogs on the beta are not affected.
Update 9:14 AM (PST): Publishing works now, expect some slowness though as we wrap up fixing this issue.
Update 16:52 PST: Blogger is inaccessible due to a problematic piece of networking hardware - it should be fixed soon.
Update 17:00 PST: The networking issue has been fixed.
