I remember reading somwhere that DoT's produce less threat per damage. However, reading through the threat discussion on the wow forum I can't find any mention of it. Could somebody enlighten me please?
I imagine the answer is something along the lines of the myth concerning HoT threat. Its not that they produce less threat its that its spread out over time making it easier for the tank to stay above your threat 'curve'.
A point of damage is a point of damage. DoT's generate just as much threat point for point as anything else, but as Emarius points out, it's spread out more so it's less noticeable. Great for offtank targets if you don't have to move to do it ;)
"They're Dragon Kill Points; not Dragon Feed Points"