I have been using this spot for a really long time now, the mobs got almost instant respawn and have a hige drop rate of usefull items !
The mobs im talking about is this Riverbed Crocolisk - NPC - World of Warcraft
Here is what i got from 1hour of work
177x Crocolisk Tail (Can me made into +90 str food - Price 100g/stack = ~900g)
89x Battered Scale (Sold to vendor for 192g)
11x Grooved Fang (Sold to vendor for 45g)
2x Green item (Disenchant and sold on AH for 50g)
340x Savage Leather (Sold for 150g/stack = 2550g)
10x random Volatile (Sold for 157g)
Total Gold: ~4.000gold/hour(title is wrong, should be 4.000gold not 3.000gold)
You should be able to make more if you got leatherworking too.