Whether an established member or new to the game here is a list of useful links to have in your favorites – one stop shopping as it were. At the bottom there is a link to a more in depth list including class specific sites. There are obviously many more sites, so feel free to add other relevant links that were not included.

Comics

• http://darklegacycomics.com/first.html
  http://www.lfgcomic.com/page/1
  http://www.tehgladiators.com/?p=1
  http://us.battle.net/wow/en/media/comics

Addons

• http://www.curse.com
  http://www.wowinterface.com/addons.php
  http://wowui.incgamers.com
  http://www.wowinterface.com/downloads/info13581-LeatrixLatencyFix.html

Databases

• http://www.wowhead.com
  http://wow.allakhazam.com
  http://www.wowwiki.com
  http://cn.wowarmory.com
  http://wow.crafterstome.com/home.html

Leveling Guides

• Alliance http://wow-pro.com/node/599
  Horde http://wow-pro.com/leveling_guides/james_horde_leveling_guide

In depth list

• http://wiki.twistednether.net/index.php?title=List_of_World_of_Warcraft_utility_websites

That's an useful post, strange we didn't had this earlier. Maybe we should add some patch mirrors as well, and I'm gonna add a link to forum banner.