From my view, if I want to get more information out of a book than super reading and dipping would provide, but I want to move at an even faster pace than rapid reading, I'll skitter. It's kind of an intermediate activation step, if you will. So if you need a little bit of really specific information, super read and dip. If you need most of the book, then rapid read. If you need anything between those two lines, skitter.
~NeverSpeak