I’ve been using xfire to search for server. It is miles above Call of Duty’s built in finders, which has lately turned to crap.
However, it just knocks out my internet connection in a way not even BitTorrent can achieve. While BT only slows down my connection, xFire knocks it out completely, including its own connection if I try to refresh the server listings.
I don’t plan to revert back to using the in-game finder until it’s fixed, but I could use something that actually works say… Team Fortress 2′s in game finder.