WowAce

Provides access to all Portal and Teleport spells on right click of one button.

Tracks vulnerability debuffs on multiple mobs

Displays the time remaining before your (temporary) pet is dismissed.

A simple addon that warns you if your pet isn't attacking while you're in combat.

Provides access to all teleporting spells and items on right click of minimap button.

Cryolysis

Display combo points for Arcane Blast debuffs

Shows current/dot cast haste values

Announces Mage Spells in chat.

Mage Portal Whisper: whisper custom message when someone asked for a portal but youre busy.

Never miss an Brain Freeze, Hot Streak or Missle Barrage proc

FuBar_MageFu

SpellSteal Now!

A theorycrafting device that does no theorycrafting...

Templar is the ultimate Mage Assistant

RealIgnite

Bitching Betty

Quartz: Magebuff module

A menu in which to select mage food based on level