There's a spot that I use sometimes that's NE of Drybone, on the northern edge of the map. There's a passage through the cliffs that goes straight north, into a cave. The cave is labeled something on the map that I can't read.
Inside is a small shrine...looks like it's got a statue of one of the Eorzean gods in it. It's just a single small room.
In the room there are about 4-5 mole spawn points. They seem to be optimal for rank 9-10ish. I fought them at lvl 11 GLD, and had no trouble with them. They respawn at an incredibly fast rate...I've never waited more than 15 seconds for a new pop.
There are also 2 Bogy spawn points (don't worry, they're not nearly as bad as the dreaded Bogy's of FFXI). They seem like a rank 7-8ish mob, but they aggro. I was able to take one on simultaneously with a mole without too much trouble at 11 GLD, but things can get a little dicey if you're not careful. Only 1 seems to spawn at a time, as far as I can tell, so they're not too bad. They occasionally use a technique where they disappear, then reappear and hit you with Curse (Magic Defense Down) and then pop you with a spell for larger damage. They're pretty manageable though, anyway.
It's a great leveling spot. Probably works best for 8-10. I left there at 13, though I had been supplementing my exp'ing with periodic leves.