Some shit that works like a chat box, just.. the chat box is connected with the server, so players playing on the server can see what you're writing in the chat box and people in the IRC chat box can see what the players are writing in the server chat. How ever, I don't think its possible to connect IRC to CS:S servers.
I think that would require alot of work from ALL OF US.. since that means that we need to moderate ANOTHER thing wich would be too much.. We already got much to think about after what I've heard and seen at least..