Ist zwar nicht von mir erstellt finde den aber dennoch nicht Schlecht
10-13 Dreadmaw Crocolisks in the river between Durator and Barrens. 14,000 exp per hour
13-16 Southsea Bandits and Cannoneers south of Ratchet. 14,000 exp per hour
16-19 Theramore Marines outside Norwatch Keep. 16,000 exp per hour
19-22 South Barrens Stormhides and Quilboards. 18,000 exp per hour.
22-24 Bears and Spiders right outside Tarren Mill. 20,000 exp per hour
24-26 Centaur north of Freewind Post in 1,000 Needles (outside the cave) 20,000 exp per hour (lots of mining opportunities; Tin, Iron)
26-30 Centaur north of Freewind Post in 1,000 Needles (inside the cave) 20,000 exp per hour (lots of mining opportunities; Iron, Gold, some Mithril)
30-32 Roguefeather Harpies inside cave on south wall of 1,000 Needles. 20,000 exp per hour (lots of mining opportunities; Iron, Gold)
Note: The Kurzen areas are generally considered broken now; especially for Horde on PvP servers. But it's all I currently know at this level as the spot was so good at the time, that is all I did from 32-42.
32-37 Kurzen camp in North Stranglethorn Vale (outside cave) 26,000 -32,000 exp per hour. This actually got better as I went up in level as long as no one else was at the camp. At level 36, I tested about 1/4 of the level and my experience rate was 32,640 per hour when I had to stop and go sell.
37-42 Kurzen camp in North Stranglethorn (inside cave) 29,000 - 34,000 exp per hour; 5-7 gold per hour. Go in past the Kurzen Commandos and Kurzen Headhunters to the Elites and Witchdoctors. The Commandos have armor, and stun you when they are low on life, so they are poor experience, but the Elites and Witchdoctors inside are the same old no-armor experience givers. I told my guild this area is just a leveling field with juicy experiene berries waiting to be plucked. I'm currently 39 here, and still doing full levels in just about 2 hours of grinding.
I didn't grind as exclusively from here on out, so I'm going to shotgun a few spots and level ranges that felt "Good". I still measured exp per hour, but this was just after the last patch where they upgraded armor and HP on most monsters I grind on, so exp definitely slowed down.
42 - 45 Woodpaw Gnolls in Feralas, south of Camp Mojache. Stay away from the Trappers and Brutes IMO, and head further south to the Mystics and Reavers. I liked the area that was still on flat land with a couple of Alpha camps on raised mounds. I usually avoided the alphas as they tended to be bugged/grouped in a cluster of 3. Spell disruption is a must for the Mystics. I cleared about 24k exp per hour here typically.
42-44 Ogres in Feralas. Due north of camp Mojache in the mountains. The Mages are best if you have spell disruption, but I worked through all of them and they were all good experience. The Brutes will throw you, so make sure they don't throw you into an add. 20-24k exp per hour.
44 - 47/48 Dustbelcher Ogres in the Badlands. Now here is a good spot, and it may be good on PvP as well. I camped this cave for 3 hours one Saturday without seeing another player. The cave is in the Southwest corner of the bladlands past a bunch of Ogres. The reason why I say the cave, is that it's about 75% Ogre Mages, and if you have spell disruption, they go down easy. Very low hp and low armor even after the patch. The only reason I left at 48 is I could clear the spawn too quickly, and I wanted to do Tanaris quests.
48-52 Dunemaul Ogres in Tanaris (great Mageweave drops). I like the NE ruins for the early levels, as I could move around it in a circle. Once I got to 50, I liked the higher density in the actual Dunemaul Compound area.
52-56 Western Plaugelands. The field with the Skeletal Slayers right by the Bulwark. Great Runecloth drops, and actually I prefered to kill the melees here over the casters (casters seemed to have the same HP and armor as melees). I've been pulling 26k exp per hour or better here.