Last night I updated the server to COD4 V.1.6 If you haven't updated your client, you won't see the server in the server browser.
http://www.the-armory.net/forum/downloads.php?do=file&id=156The v1.6 patch for Call of Duty 4: Modern Warfare has been released. Here are the fixes/changes:
• New maps Creek, Chinatown, Broadcast, and Killhouse
• Hardcore and oldschool server browser filters
• Fix for a Denial of Service attack
• Includes all the changes up to patch 1.5
You can download the patch from FilePlanet or nVidia.
I'm still working on getting the maps up and running. (submitted a trouble ticket to FPS last night).