Update: The server has now moved and everything is back up and running. It was down from 23:40 to 00:50.
The server that hosts this web site and the PRC L4D serversis being moved to a new facility tonight between 22:00 and 05:00 tomorrow. The server will go down at some point between those times and should be down for less than 2 hours, although the game servers will be unavailable until some time later in the morning.