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Official Blizzard Site
http://www.worldofwarcraft.com/ -- Main community site
http://www.wowarmory.com/ -- Characters, Items, ...

Super Guide
http://www.wowwiki.com/
http://wow.allakhazam.com/
http://wow.tentonhammer.com/

Database
http://www.wowhead.com/ -- Talent tree
http://thottbot.com/ -- Quest, Items
http://wow.gamepressure.com/
http://www.wow-loot.com/ -- Loots for each class

Raid
http://www.worldofraids.com/
http://www.worldoflogs.com/ -- Keep raid logs