Clans and Guilds

Apoc
Provides member information, screen shots, downloads and a public server.
http://www.apoc.org/

CJB
Includes forums, clan rules, and a roster.
http://www.unrealclancjb.5u.com/

Drunken Ninja Monkeys
Includes rosters and Java chatroom.
http://www.freewebs.com/dnmleader/

Evolved Systems
Includes a roster, forum, image gallery, command list and tweaking guide.
http://www.evolved-systems.net

Kick Ass Cowboys
Includes clan rules and forums.
http://kickasscowboys.com/

Omnipotents
Includes forums, server information, player statistics, and a roster.
http://www.omnipotents.com

Shooting Elite Xtremes
Forums for discussion, recruitment, member profiles and images.
http://s9.invisionfree.com/S3X_UT2004_Clan/index.php?act=idx

Super Shock Soldiers
Forums for discussion, recruitment, server information and clan history.
http://ut2004sss.proboards34.com/index.cgi

Thunderdome
Has multiple games servers, Insta DM, TAM, CTF. Provides news, forums and Teamspeak server information.
http://www.thunderdomeclan.nl