Battle.net Open Technical Support Forum: Offers technical support discussion for all Blizzard games.
BattleForums: Discussion forums for Warcraft, Diablo, and Starcraft, as well as general gaming and chat.
Blizzforums.com: Web forums and news for all Blizzard games.
Caught in Blizzard: Yahoo! Group for all Blizzard games.
Prolix - Battle.Net Binary Bot: Prolix is a Battle.net, bnetd, and fsgs binary chat bot.
Warcraft3.com: Offers a variety of discussion forums.