Lockwolf is very kindly renting a Left 4 Dead server in New Jersey, USA for our American members to use. This is an official server, so uses the PRC SourceBans and HLstatsX installations.
I would also like to take this opportunity to thank Lockwolf for doing a sterling job setting up the forum, as it is now a great place for community members to hang out and communicate outside the usual chat room we use to organise games.