Helpful sites

Generally Useful:
http://www.wowarmory.com/ - For Evaluating other character's gear.
http://www.warcraftrealms.com/ - For evaluating guild applicants.
http://www.wowjutsu.com/us/azgalor/ - For finding out a guild's progression
http://www.wowwiki.com/ - A little bit about everything.
http://www.wowhead.com/ - A little bit about everything.
http://www.thottbot.com/ - A little bit about everything.



Hunter Specific:
http://elitistjerks.com/f31/t13107-hunter_shot_rotation_illustrated/
http://elitistjerks.com/f31/t9816-hunter_spreadsheets_--_development/
http://www.bigredkitty.net/forums/index.php?topic=1003.0
http://petopia.brashendeavors.net/index.php
http://www.bigredkitty.net/


Gear Evaluation/Selection:
http://rehfeld.us/wow/damage-reduction.html
http://be.imba.hu/
http://www.wow-loot.com/hunter.htm
http://www.warcrafter.net/
http://www.chardev.org/


... More to come.