Take both a mage and a paladin, this method only works if u are boosting 1-3 chars tho. Check this power leveling video out =).

http://www.warcraftmovies.com/stream...stream=Youtube

SImply u have the paladin pull everything, then on 30% the mage leaves the grp and frost nova all, paladin runs out of the instance, and mage kills everything = 100% ex to ur alts.