Just found a nice way to grind from 48-55ish, here's what you do.
1)Go to the Eiglophian Mountains
2) Pick up the quest "Path of the Raven"
3) Head to coordinates 470,241
Here's the magic. Every time you approach the bowl, a level 50 will spawn to 'guard' it. Just find the range at which he spawns, and walk into it, kill him, take a step back out and in and he'll spawn again.
He drops no loot however, so don't expect to get rich off of this, just a good way to make some quick levels if you find yourself lacking quests or not wanting to do them.
(I suppose if you felt so inclined you could set up a autoit or g15 macro that went in/out casted the spells to kill him, and repeat)