The site will be unavailable for a short period this Wednesday (August 15, 2012) starting at 22:00 PDT while we perform a much-needed database upgrade.
During this maintenance, all access to the website and repositories will be disabled. We expect the maintenance will take only a few minutes, but if the maintenance window exceeds 15 minutes, we'll initiate rollback procedures. We'll update this blog post when maintenance is complete.
We apologize in advance for any inconvenience this may cause with the promise that you can look forward to an even faster GitHub once this upgrade is complete.
UPDATE: The maintenance has been completed.