In Kun-lai Summit on the island, there are at least a couple spawns of mobs that respawn instantly which makes them excellent for grinding or cloth since they are humanoid. Each mob is worth 13,148 experience to a level 88, mobs are level 87.
I also used the glitch mentioned here, http://www.ownedcore.com/forums/worl...ease-dont.html ([MoP Beta] Army of NPCs - 1 mil dps - Crash Realm (please dont)). Please note if you do that you must tag mobs first as if your pet does 100% damage you receive no experience.
Video:
Instant Respawn Mobs (MoP Beta) - YouTube