I ran into this place when I was questing for the Ebon Blade faction to get rep with them when there were around 2 quests you get later on in this place. You've probably been here before but you probably haven't thought about farming here.
Anyway, in this place there are 4 green portals/glowing statues/whatever with A LOT of skeletons walking around in circles in this area. These skeletons drop between 10-40s per mob, normally between 20-35s per mob. And the good part is that their hp is ridiculously low, so low that I can one-hit 3 of them in a multi-shot with my hunter if I crit. And this "path" is a very small area but with around 40-50 skeletons as well as a quest mob with about same amount of HP as a regular mob.
The cash drop as stated above is like any other 80 mob but with this amount of HP it's amazing way to farm gold. Being an AoE class makes it even faster since you just pull everyone and AoE them down smooth and easily. Greens are also commonly dropped.
And if you see the small cave just a little above the marked area on the map, fly up on that mountain to the very tiny camp and get the quest for that place from the Death Knight Gnome on the horse.
Here is a map:
http://rapidfiles.net/images/40331icecrownfarming.png