StackOverflow Is Down (stackoverflow.com)

"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."

... and it is back up.

"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