Nice list, even since im in the guild (relatively a lot of time) I've found Rett's addons essential for WoW life
Still I'd like to add a few of utility
Paranoia Enemy Alert (may be out of date) - Tells you when an enemy player is spotted and shows you their class, level and a link to target it/them
Download:
http://wow.curse.com/downloads/wow-addons/details/paranoia-enemy-player-alert.aspxGatherer DB - It is a huge database of all Mining, Herbalism and Treasure nodes known so far, works with Gatherer and Cartographer addons (from Rett's list)
Download, instalation instructions and further info:
http://www.wowinterface.com/downloads/info11707-GathererDBWoWHead.htmlAlso here I include a WoW-AddOn site with Categories, Info, Description and Instant Download of AddOns:
http://wow.curse.com/downloads/wow-addons/default.aspxAnd some other info about some of Rett's AddOns:
-Titan: Useful toolbar wich tells you status about Coords, Gold, Xp, Repair info and more
-Ackis Recipe List: Bassically tells you wich recipes (of any profession) you are missing, and how to get them
-Cartographer: May be the most useful addon in al WoW, its a revealed map of all regions as well as it provides Coordinates of each zone
-Gatherer: It records, gives info and shows you on the minimap every Herbalism, Mining, or Treasure node that you, your party and your guild uses (as long as both of you has the addon) Works with Gatherer DataBase
-LighHeaded: Its a quest helper wich gives you community-provided info and map/HUD-viewable choords for NPCs, and key places
-OneBag3: WOTLK compatible AddOn that shows all of your equiped bags as if it was one, even if the idea doesnt seem attractive, try it as you will notice it is extremely useful
-RatingBuster: Tells you info about the buffs or debuffs every wearable causes on you, this image talks for itself