Dragon here again. I thought i would post about some add ons that are good for mages.
Portal Box: Keeps all your ports and teleports in one nifty button.

Quartz: Its a nice modular casting bar and you can rely on it.

OminCC: This can be used for any class, but it watches your cooldowns on stuff.

Decursive: It is not just for mages either. This one really helps when you are in raids and can help keep those nasty curses off the raid.

Manyitemtooltips: Just a nice addon.

This is all i know about for now. If there are any mages out there, feel free to add your own.

Happy Raiding and Questing....