This spot is recommended to Shadow Priests and Warlocks because their DoT's can kill any mob without ever having to refresh(assuming you are are 900+dmg) Anyone with a healer can take advantage of this place though.
Here is a picture of the spot. This is Legion Hold in Shadowmoon Valley.

The 3 pylons have 4 mobs each on them and there is 1 mob that walks along the infernals on each side. That is a total of 14 mobs.
When you first start it will seem like no mobs are respawning, but then once there are less than 6 mobs total, they will start instantly respawning pretty much on top of you. They will never stop unless you leave 6 mobs up, then they start to respawn at a natural rate(about 5 minutes).
The only thing you need to watch out for is the big elite dude that walks around the area every 10 minutes or so. If you have a healer you can kill him(I tank him on my shadow priest with another dps/healer there)
Enjoy!!!
EDIT/ADD: These mobs drop netherweave, aldor rep items, and have a chance for all level 70 epic items because they are within 3 levels of the item level. Definately one of the best farming spots there is, especially since rep items sell for tons.






