The group is there for the sole purpose of players with microphones to be able to post announcements asking other players in the group if they would like to play Campaign/Versus with them.
http://steamcommunity.com/groups/L4D-Mics (http://steamcommunity.com/groups/L4D-Mics)
Give me a copy of L4D and I will. As for a name idea, I got nothing.
It's up :D!