It seems that bugs and exploits from World of Warcraft Patch 5.2: The Thunder King are still being found at an alarming rated. This exploit has to do with farming unlimited amount of materials and was originally discovered while leveling up the skinning skill, but it works for anything with a timer.
If you spam your mount keybind (doesn’t have to be mount spell, just about any spell works) while your character is skinning (or doing something else) it will give you the leather and there is a high possibility the corpse will not despawn so you can skin it again and again and again.
As I said this is not limited to just skinning, it also works with mining and harvesting and although it’s unconfirmed now, it might even work on chests. If you find out, please post here to confirm.