Levelling 2 mages = frost ftw.
Key talents: Ice Shards, Frostbite and Shatter.
At 43+ with my mageteam (prolly gonna do full 5) I'm looking at http://www.wowhead.com/?talent=oV0VcZVgGz0b0o for AoE, (in WotLK, blastwave gets knockback and some awesome +crittalents in fire that works with AE).