Yahoo! Groups: rpg-tools - Mailing list and group to share information about tools useful to people creating imaginary worlds and using them for storytelling, writing, roleplaying or wargaming. - http://games.groups.yahoo.com/group/rpg-tools/
Yahoo! Groups: world-create - Forum for world creation and development. - http://games.groups.yahoo.com/group/world-create/
Creative Conclave - A collaborative effort to create an original fantasy world for use in role-playing games and writing. - http://forums.delphiforums.com/splendour/