i found a spot on my level 70 prot pally that i've been AoE farming for a good few hours now. Skorn in Howling Fjord. The mobs are packed pretty tight, they hit weak, and drop a decient amount of $, cloth, and greens. I started AoE farming here halfway through 70, now i'm a half bubble from 72 and still going strong. This isn't nearly as good as the alliance one, but, it's the best i've found so far for horde. It even beat questing by a bit, although it gets extremely boring.
I'm getting 414K EXP/hour and 226 gold/hour here.
My friend came in here with his 80 prot pally, he's bringing in ~430 gold/hour. So, not a bad farming place for an 80 either.
Pics:
http://i718.photobucket.com/albums/ww185/codydude0815/HowlingFjordbig.jpg
by codydude815