WorldofWar.Net
Offers news, information, movies, screen shots, forums, journals, live chats, and item database.
http://www.worldofwar.net/

WoW Warcry
Contains news, screenshots, game information and forums.
http://wow.warcry.com/

WoW Catacombs
Includes news, game information, guides, and forums.
http://wow.catacombs.com/

WoW Vault
News, information, screenshots, and forums. Also offers guides and guild tabard creator.
http://wowvault.ign.com/

Planet Warcraft
Features news, world and player guides, FAQ, forums, and is part of the GameSpy Network.
http://www.planetwarcraft.com/wow/

Game Banshee - World of Warcraft
Daily news and a searchable equipment database.
http://www.gamebanshee.com/worldofwarcraft/

WoW.WarcraftStrategy.com
Contains news, game information, screenshots, guild list, item and quest databases, and forums.
http://wow.warcraftstrategy.com/

WoW Central
Contains news, information, screenshots, a chatroom and forums.
http://www.wowcentral.com/

Gameamp - World of Warcraft
Includes general game information, guides, instance maps, forums.
http://worldofwarcraft.gameamp.com

World of Warcraft Radio
Radio channel about the game run by volunteer DJs, broadcasts mainly talk but also music.
http://www.wcradio.com/

Blizzard - World of Warcraft
The official site containing news, trailers, gameplay videos, wallpapers, screen shots, and the official forums.
http://www.worldofwarcraft.com

IGN
Game information and preview.
http://pc.ign.com/objects/016/016985.html

GameSpy
News, previews, features, interviews, screenshots, movies, and a review.
http://pc.gamespy.com/pc/world-of-warcraft/

FilePlanet
Download page for movies, patches, wallpapers, and interface utilities.
http://www.fileplanet.com/54005/0/section/World-of-Warcraft

Warcraftmovies.com
Site has a large database of World of Warcraft movies.
http://www.warcraftmovies.com

World of Warcraft Guru
Contains databases on WoW Quests, Items, Spells/Abilities, Mobs, NPCs, and UI mods. Also has forums.
http://www.wowguru.com/

Warcraft Realms
Offers server population tracking and statistics via the website and with use of the add-on "CensusPlus".
http://www.warcraftrealms.com/

Azzor's World of Warcraft
Strategies, forums, mods and news.
http://wow.azzor.com/

Warcraft Wars
Offers information, resources, news, and forums.
http://www.warcraftwars.com/

CTProfiles
Database that allows players to save their character information on the Internet for other players to access and view. Also tracks basic guild information.
http://ctprofiles.net/

MMO-Champion
Articles and forums with game news and raiding strategies.
http://www.mmo-champion.com/

WOW Insider
Offers game news, strategy articles, game tips, humor, and player opinions.
http://www.wowinsider.com/