This video demonstrates how an affliction warlock can level once an hour (or twice an hour if rested!) until level 52.
The only other way to level any faster in this dreaded level range is with the help of two level 70's and an instance exploit. This can be done in trash "of the eagle" greens.
I hope this doesn't make everyone roll warlock. :P
In b4 nerf.
Me playing against ZachAttack! at the Ridgemar Mall. I've never played this song before, and I had a full stomach, so I think I did pretty good. He'd totally rape my score if he bar'd it.