"Stack Overflow is currently offline for maintenance Routine maintenance usually takes less than an hour. If this turns into an extended outage, we will tweet updates from @StackStatus or post details on the status blog."

"We are aware of a SQL load issue affecting Stack Overflow and are accessing it now." - from @StackStatus on Twitter. It would be funny, if they found the solution of their problem on StackOverflow in google cache

... and it is back up.