Ok so I am kind of well geared. I am a human rogue and I’m speceed combat dags, which is a bad choice for this, I should be combat swords or something but anyways.
I also have imp sap. Go to the crypts instance in auchdoun and stealth to the very end of the second room.

There's several good aoe spots in the outlands(you can't have mine lol):p It basically takes a team of 2. It could be done if you are an sl lock but just not worth the time. I've powerleveled and farmed with basically every class with this ONE warlock spell. Just have your buddy round up a bunch of mobs and hold them in place while u toss out 5-6 seeds out.

This is doable at level 60 with 3 talent points in to improved blizzard apiece.

it works as follows:

mage 1 runs around using fire blast, arcane explosion and blink to annoy as many mobs as possible without getting killed. once critical mass is achieved and the mobs are reasonably close together, hit frost nova.

I enjoy grinding off humanoids. I have no idea why. I choose it over beasts. So when I was level 56 I wasn't sure where to go. The level 56 undead in WPL that freeze you are just not worth the effort so I went looking and I didn't have to go far. I hit up EPL and vered a bit off the road to the undercroft. There are Mossflayer zombies there and the only thing that they do other than melee hand-to-hand is an instant spell that reduces stamina & spirit by 28. I can live with that. There is a perfect amount of mobs for me to maintain 38k/hour exp. There is only one mob there that is close enough to another to link and you can completely skip him if you want.

The target is Razorfen Downs located in the southern barrens, this instance is for about levels 35-45.

To do this run you need to be a rogue level 60 (maybe a bit below) and you also need to have enchanting
When you enter the instance go into stealth and follow the map outlined (it may be a bit incorrect but u get the idea, just get to the last boss)

http://img295.imageshack.us/my.php?image=86full4fy.jpg