Well the easiest way to power level is to quest, but my guild (Men of the North) has found a pretty awesome way!
First quest as normal and doing normal quest (outside of instance) bring a lvl 60 cleric with you! Do not go in party! Put Healing Word and Astral Shield on hot bar and ONLY use those. This will not limit your xp gain and you will not blow any pots and can really rush through everything!
Also dont forget to be using the map "THE FASTEST XP MAP EVER" or whatever it is called by yourpainkillers. This map can be done once each hour. The best method is to bring a lvl 60 CW go in party and have him travel there with you entering the circle so the ogres are lvl 60. Have the cw put shield on hotbar and jump on ledge DIRECTLY in front of ogres and push, getting you a mass amount of xp! (about a lvl each time until lvl 40)
Try it out i have 6 toons at 60! Trust me it works!