To date, more than 2700 questions about SharePoint have been answered on SharePointOverflow.com. But the site may not last. The host, StackExchange has given an get up or get out order.
In order to keep SharePointOverflow alive, the site must convert to StackExchange 2.0.
Update 3/10/2011: Don’t forget to build up your reputation on StackOverflow.com, ServerFault.com, SuperUser.com or one of the other StackExchange sites. The proposal has enough volunteers by number now, but it needs 30-40 more of those who have committed to earn at least 200 reputation on at least one of the sites above. I suggest answering or asking a few questions on StackOverflow about SharePoint as there is a lot of SharePoint activity there.