Zan'vess, a spot in Dread Wastes will serve people well to "insta"-farm their reputation as well.

There is a spot there where about ~12 mobs instantly respawn. As a warlock you can solo AoE the fuck out of this place (with the right talents) and go from friendly to honored in less than 30 minutes as well. Or you can group with a bunch of friends and AoE the fuck out of it and you'll be honored before you know it as well. It's just a constant stream of reputation...