WoW UI Tutorial - pvptutorial.com

External Links

Addon Locations:

• Curse.com
• Wowinterface.com
• Wowmatrix.com - Automated updating
• Wowace.com

Worth special mention:
Vranx.com - descriptions of hundreds of addons
Creating a clean UI - (Video) Tutorial by Redmist
omgphatloots.org Tutorials.

Discussion Locations:

• Official World of Warcraft UI & Macro Forum
• Official World of Warcraft PvP Forums
• Arena Junkies