Massive Multiplayer Online

Battles of Tenadia
Browser based massive multiplayer online roleplaying game. Includes account management, game information, frequently asked questions, news, back story and message boards.
http://www.tenadia.com/

Curse.com
MMORPG downloads, forums, news, guides, videos and screenshots.
http://www.curse.com/

Dark Swords
Offers information and client download.
http://www.darkswords.eu

DOFUS
A cartoon style fantasy roleplaying game. Website includes game information, an online shop, technical support and community forums. [French/English/German/Spanish] [Flash Required]
http://www.dofus.com/

Game-Asylum
Game information for EverQuest II, Final Fantasy XI and World of Warcraft. Includes reviews, maps, skills and class information.
http://www.game-asylum.com/

The Hub: Exploring the Psychology of MMORPGs
Online research by Nicholas Yee. Featuring studies, essays, and forums.
http://www.nickyee.com/hub/

Lagoon B
Place to register for the tropical economic simulation game.
http://www.lagoonb.com/

Mapfiend.net
Downloadable maps for EverQuest, City of Heroes and World of Warcraft. Includes tools, forums and links.
http://www.mapfiend.net/

MMOSite: 9 Dragons Online
Offers information, screenshots and articles.
http://9dragons.mmosite.com/

MMOSite: Rappelz
Offers articles and information.
http://rappelz.mmosite.com/

MMOSite: Trickster
News, guides, data, screenshots, multimedia and discussion.
http://trickster.mmosite.com/

The Reincarnation
Free multiplayer online game (no download required) Manage a kingdom, make alliances, train a army of magic. Join a guild to take other guilds in guild wars.
http://www.the-reincarnation.com/