WowAce

MarySue

Shift-clicking on a user name in chat shows a tooltip with their whois information.

MonkeyPirate

Advanced Chat Filtering and Spam Blocking Addon

Make noise when the servr is going to restart

Bug fix for the Blizzard calendar -- prevents unexpected window closure while editing events

TwiCo

It's a doodle pad for doodling with doodles.

Provides bang-whispers for your professions.

A system config addon to WOW

Saves who searches in a favorites list.

Send Mail to Groups

Enables cooldown notification between players and allows party members access to each-others spell books.

LootWhore

Sets you to DND when you fight a boss, and some other crap.

BossWhisperer

Keeps track of people who have recently sent you messages.

Provides a virtual keyboard of extended-ASCII and Unicode characters which can be inserted into text areas.

Alert your friends when you ding, get an achivement, or get phat lewts!

ChatAssist2Options