Requirements:
Gold find gear
Access to the end of Act 1
Start a game on Act I, Sword of the Stranger
Waypoint to The Royal Crypts
Break all the pots all the way up to the skeleton-summoning room.
Leave game
Resume game
Repeat
On Inferno, with +168% gold find, this is getting me approximately 10k a run. A run takes anywhere from a 1m 45s to 2m once you get the hang of it. You run into a few skeletons (three to four a run, maybe more if they pop out of chests) so dont get your damage too low (mines a little over 6k), and about a rare a run if you've got a little Magic Find thrown in there with it. Also a reasonable amount of Pages/Tomes.
This also works in all difficulties.