WowAce

Reports in raid chat whenever a raid member "fails." /EnsidiaFailsCataclysm to configure.

LibGUIDRegistry-0.1

A library to assist in adding custom data in the character stats pane.

Provides compact ability duration bars for many cycle dependent classes.

Allows the marking of targets using indicators that attach to nameplates.

ColaMachine

Lets you Shift-Click artifact traits to chat

Loooooot!

Skin Blizzard buttons with ButtonFacade

nanoPlayed

Grid status indicator for PvP flag

Highlights the action bar spells that need to be kept on target or player

PimpMyProfession The Profession Guide

This Addon will show the raidmembers with the lowest mana so you can see the potential targets for your hymn of hope.

Simple search for your guild bank

Amanuensis

Shows a bar when your Lifebloom spell is active on a PitBull unit frame.

Adds Auctioneer "bought for" filters to Baggins ("disenchant", "vendor", etc)

Warns if anyone has taken too much damage to cause the Orb Whisperer achievement to fail.

Chooses the most expensive quest reward and vendors it when possible