QUEST CAN BE DONE IN TAWLONG STEPPES NOT DREAD WASTES SORRY MY BAD!
Hello all i just found good way for nice xp if u are rested. I didnt find anything about this on forum.
You need be level 88 and be in Tawlong Steppes its quest Terror of the Dread Wastes - Quest - World of Warcraft ( u need have done some prequests i think) where you will be killing big ugly worm...
When u kill big worm you gain like 210k xp per kill if u are rested. U can kill him like in 1 min. after that try to abandom quest asap after the kill, because the questgiver runs up back to village and it's faster if you just abandom it after the kill and get it again.
here is screen: http://img267.imageshack.us/img267/6836/xpkill.jpg