I've been here for... Dunno... 367 days, and haven't posted anything worthwhile.
On some private servers, rogue poisons are bugged, and proc on every single hit of the weapon. The poisons are:
Wound (all ranks)
Instant (all ranks)
They can be purchased in Orgrimmar or Ironforge.
This exploit would allow rogues to do massive amounts of damage in a short period of time.