WowAce

Hitman

AutoFIR

A seperate focus bar, with focus gain prediction and rotation forecast.

TableTopLib

Shows Chat as Combat Text

FelwoodFarmer

A module that lets you find out what today's dailies are without having to visit the quest givers.

Manages the scanning of the auction house in a reliable an efficient manner.

A popup menu containing user-programmable scripts.

LFD status via a DataBroker display rather than the minimap.

FuBar_DPS

Angry Boss Reminders helps raiders switch to the proper talents, glyphs, and gear for each boss during a raid.

Shows a nice Soulstone Monitor.

Show coordinates on minimap

Reverse Engineering will drill down and search your tradeskills for their elements

Adds a highlight border to items in your MogIt Wishlist, making them easier to see.

Allows for easy congratulating when someone earns an achievement.

Automatically invites player from templates.

Handles the assignment, coordination, and announcement of many parts of the Lich King encounter in Icecrown Citadel.

KC_Mobility