World of Warcraft - WoW EU Site
World of Warcraft - WoW USA Site
the Armory - Info about Players, Arena teams, Boss loot and lots more!
Jaedenar Forum - take a guess!
Battlegroup MISERY - the Forums for our Battlegroup
Thottbot - Great site with items, quests etc etc.
Allakhazam - Another great site with lots of info
Wowwiki - Lot's of information here!
Wowhead - Even more Info
Curse Gaming - a Site with all the Addons you'll need.