Mage

Mage class leader is: Andisoftman and Hutson

There is some excellent information on the Mage Class page at WoWWiki here

Tips

• Check out the WoW Europe Mage Forum here
• Zul'Gurub - Some words about a Mage's role can be found here

Spells levels 1 - 70

• Mage spells here

Checklist before raiding

• Have your pockets full of Conjured Crystal Water, if you can't do them yet grab some guildies and hurry to DM for the quest Arcane refreshment
• Bring lots of Arcane Powder for buffing Arcane brilliance
• Repair

Addons

Decursive continued
A must have for every serious mage, shows curses on raid members and has a one-click removal function. The add-on can be downloaded from here

And don't forget to check the Must-Haves for a RAID

Mage Levelling Guide

From www.worldofwarcraft.com:

The player-created Class Guide main page on www.worldofwarcraft.com. The page offers links to amazing class guides created by the World of Warcraft player base! In them you will find tips, strategies, and other useful class related information.

See the full page with loads of information here