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.

Cryolysis

Announces Mage Spells in chat.

Shows current/dot cast haste values

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

Display combo points for Arcane Blast debuffs

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

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

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

FuBar_MageFu

SpellSteal Now!

A theorycrafting device that does no theorycrafting...

Bitching Betty

Quartz: Magebuff module

A menu in which to select mage food based on level

Templar is the ultimate Mage Assistant

RealIgnite