WowAce

Displays the zone level ranage of the zone you are in and also gives you a suggest zone and instances to be in.

Calendar improvements

Shows current/dot cast haste values

FuBar_ButtonSmashFu

Open all your mail

InspectFix

Priority 3 loot announce addon

Clean looking square minimap with many options.

Tells you who bought your auctions.

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

A volume control for Data Broker.

Profiler of the Lords of the Zodiac guild.

Allows frames to be dragged around, without permanently changing their position.

Show where the chests are for Withered Army Training

Keeps track of current money and all your characters on one realm.

LibDogTag-2.0

Warns you with sounds when you gain different shaman spells.

GirlFriend

Keep your pet fed

Combat log replacement