Promethean and SmartBoard technology experience

The word NONE basically sums up my experience with these technologies. At least any hands on experience. I have seen the SmartBoards used in most of my classes, but not in a way that would help me if I were to have to use one. I have only heard about the wonders of the Promethean boards. Apparently they can clean your house and make you a sandwich, but I have never seen one in use, and I honestly don't know what the difference between this and a SmartBoard is, or even if there is one. I would absolutely love to learn how to use these things, and I can definitely see how they could be very valuable tools in the classroom, but right now I really know basically nothing.