I just do the lv 44 dungeon. Basically you pull everything on the 1st floor of the that dungeon into the 1st room and spam AoE's. Then when they are all down leave the duty and do it again. Its 50k exp. per go and only (should) take 3-5mins. This can be done with one healer and three dps or just a regular group. You can also farm Lv 47 dungeon this way. Down side is you have to make your own party to do this.

This is just my way of lving. but until you get to lv44 to do this. I would suggest doing what others. have listed. Dailies, leve's, ect.