We have a Left 4 Dead server to call our own.
217.163.22.24:27015
I think the command is "connect 217.163.22.24:27015" inside L4D as along as you have console active (theres an option for it then press ` key iirc).
Message me on steam for the pass. Am still working out how to get it to show as belonging to the group, so bear with me.