I don't know if this has been posted or not and I didn't see it so I thought I'd post it. From the quest Harbingers of Shadowmoon (http://thottbot.com/q10643) you get the quest to kill these ghosts that you can only see while wearing spectrecles. However, you can continue to kill them even after you've killed 20 of them, making this an incredible grinding spot. They're passive so you don't have to worry about aggro, they're in town so you don't have to worry about horde, and they are humanoids that drop 10-20ish silver as well as cloth. The respawn rate on them is pretty quick as well, and I never had a problem killing them too fast. Enjoy!
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