The server the boards are hosted on will be migrated to a new machine sometime in the next week. This is to avoid some of the capacity issues that brought down the boards due to another site being hammered.
DNS entries were set to a very low TTL a few days back to minimize downtime, but it is possible the boards may be inaccessible for a bit after the move. Please keep this in mind if you experience any issues in the next week.
I'll post a better ETA for when the actual switchover occurs once I know more. Overall, it should be seamless for most people.