- maraudon if ur a hunter and knows how to pull vyletongue without adds (not my case)
- sm bosses, if ur using teleport hack
- azshara elves and demons if ur a rogue (works best with 2 people)
- felwood elementals for essence of water, specially for rogues and hunters
- guardian stones from ungoro if ur a druid or a pally (never tried to kill guardians with rogues, but i believe its a hard thing to do)
- devilsaur leather if ur lw and can kill a devilsaur in ungoro. Not sure what classes can do it, but i think most of lvl 60 players can
- diremaul east, specially if u are a miner, of course u need at least 3 men to kill all bosses, but works great, in 15min u get to kill al bosses and some thorium veins at the end
- undead at eastern plaguelands for rogues, tons of mobs, some rich thorium and fast respawn
I've seen some people farming elite dragonkin at steppes but i dont think its worth it (maybe if ur a lw)
If you consider reputation some other nice spots are:
- backwood furbolgs south of felwood: u can get rep with the other furbolgs and drops to cure the plants while u do it
- furbolgs east winterspring: u get rep with the other furbolgs, do the winterspring mount quest (if ur alliance) and tehres a chest spawn there
- twilight mobs at silithus: u get rep with cenarion, the set items to summon bosses and runecloth, works better with 2 or 3 people