A lot of people struggle with grinding 30 - 40 (including myself). I recently finished it up with 2 characters. I grinded and quested a little with them. But here are the spots I used. Some people may not like them, but I loved them.

All these spots are in Arathi Highlands. Arathi is great (alliance wise), because there are not many quests that take place here. There is a horde city, but there are not too many horde. Not only that but I never saw too many alliance either.

I will try and find thott links tomorrow with maps of where I am talking about.


Northfold Manor
Not the best spot, but pretty decent. May want to be 32 before you start here. Some of the mobs are stealthed as well and their is a quest to kill these things which you can get from Refuge Point.

Boulderfist
This spot is near northfold, just a bit south. I think the ogre's start at around 34ish. There is also a cave the Ogre's spawn in. These things drop fast, on my mage I was able to get about 3 fireballs off before they were in melee range. And by then all it took was a fireblast and they were toast :).

Go'shek Farm
This spot is alliance only for grinding. It is east of Refuge Point. This spot is great. The orcs range from 33-35. Me and a friend were AOE grinding on our mages and easily tearing through 14 at a time. Then move onto the 2nd/3rd parts of the farm. Was very fast and great exp and tons of silk.

Those are the three spots I used till about 40, stopped around 39 on my mage and my rogue and grinded in Duskwallow march which really is not the best choice. But got the levels done. There are also elementals in Arathi which are pretty good, as well as higher level ogres and some witherbark trolls. Sorry if this stuff is a repeat. But recently finished the 30-40 grind on my alts. Hope this helps anyone. And also sorry that the info is not that great. If you have any questions please ask. Thanks.