WowAce

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

ItemRackFu

Shows you which bosses you've killed next to the raid finder frame.

AnchorsAway

SinkLib

Emerge@Durotan-EU Raid Tracker

Privacy2

Lists Pots and Herbs you got on all chars and allows you to specify color coding

Test whether the player can really dispell a buff or debuff, given its talents.

IDCard

Adds four icon indicators to Grid (top, bottom, left and right).

Dailies Quest Tracker

Replacement for WoW's flash/fade functions.

Show vignette icons sooner

Puts a timer in /yell when you get Unbound Plague during the Heroic Professor Putricide encounter

nRaidTracker

Check the quality of wild battle pets

AutoFIR

GridStatusIncomingHeals

NielasAran