Official sites
The official European site (http://www.wow-europe.com/en/)
The official US site (http://www.worldofwarcraft.com/)

WoW Addons & UI
WoWUI @ IncGamers (http://wowui.worldofwar.net/)
Addons at Curse.com (http://wow.curse.com/downloads/addons/)
WoW Interface (http://www.wowinterface.com/find.php)

Quests, Items Databases
Thottbot (http://www.thottbot.com/)
wow.allakhazam.com (http://wow.allakhazam.com/)
WoWHead (http://www.wowhead.com/)

Macros
In WoW, a macro is a method of combining several actions to execute in a single button press or keystroke.
I would recomment to refer to WoWWiki (http://www.wowwiki.com/) for macros examples:
Druid Macros (http://www.wowwiki.com/Useful_macros/Druid) | Hunter Macros (http://www.wowwiki.com/Useful_macros/Hunter) | Mage Macros (http://www.wowwiki.com/Useful_macros/Mage) | Paladin Macros (http://www.wowwiki.com/Useful_macros/Paladin) | Priest Macros (http://www.wowwiki.com/Useful_macros/Priest) | Rogue Macros (http://www.wowwiki.com/Useful_macros/Rogue) | Shaman Macros (http://www.wowwiki.com/Useful_macros/Shaman) | Warlock Macros (http://www.wowwiki.com/Useful_macros/Warlock) | Warrior Macros (http://www.wowwiki.com/Useful_macros/Warrior)

Other Information & Guides
World of Warcraft Top Sites (http://www.wow-top.com/)
Guides at Allakhazam (http://wow.allakhazam.com/db/guides.html)
Leveling Guides Download (http://www.icicg.com/freeguidedown.htm)

The different class macro sites is completely listed wrong, other than that it looks fine :)

great info...good work ;]

Good job! Thank you for sharing.

1 more - http://prize.bg/Nox

I want to make a suggestion and add a direct link to the add-on known as QuestHelper under the Quest section of you're topic.

add one more,wow news :http://www.wowinsider.com