Top MUD Sites Forums - MUD and RPG discussion forums for players and administrators. Covers building, development, legal issues, MUD promotions and events. - http://www.topmudsites.com/forums
Gammon Software Solutions Forum - Support site for MUSHclient and PennMUSH. Also provides MUD coding help for beginners. - http://www.gammon.com.au/forum/
The MUD Connector - Covers various topics including administrative ethics and area building. - http://www.mudconnect.com/discuss/discuss.cgi