8:51 AM, PDT: Ahoy everyone! Flickr is experiencing problems at the present time, and our engineers are all in the main engine room, working on resolving the issue. Please hang tight, and we’ll have things back for you as soon as possible. If we need to, we’ll post an update for you here.
9:18 AM, PDT: Hello! All hands are on deck over here and we’re still working on getting things back up for everyone. Apologies for the disruption!
More from the Flickr staff themselves: http://blog.flickr.net/2009/10/20/thar-be-dragons/