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External
Popular sites that we use, not part of the forums are listed below:

http://www.reddit.com/r/wow - WoW Discussion
http://www.mmo-champion.com - News, Forums
http://www.blizzardwatch.com - News, Blogs
http://wow.curse.com/ - News, Addons
http://summonstone.com/ - High-end Class Guides (WIP)
http://www.arenajunkies.com/ - Arena/(Rated BGs)
http://www.wowhead.com/ - Database, Guides
http://www.wowpedia.org/Portal:Main - Warcraft Wiki
http://eu.battle.net/wow/en/forum/ - EU forums