still down. but for anyone interested. you can still find servers using gametracker. and gametracker has a gametracker lite, which you use and add cod4 to it. then when on gametracker you can click join next to a server and it will join the server directly.
my favorites still show for me, its just the master server list thru the internet tab that wont show any servers now. but still now and then like looking for servers and this is what i do for now.
some also say there is a cod4x thing that is out that is supposed to help fix many issues players have. i have not looked much into it as the game works for me.