Blizzard forums ofc: http://forums.wow-europe.com/board.html?forumId=10017&sid=1
maxdps:tips calculator about dps : http://maxdps.com/
bosskillers, strategies etc... : http://www.bosskillers.com/cgi-bin/bbguild/index.cgi?action=welcome&sid=VOAgn5coiY
i will come up with more later...