Mind mapping(tm) is a way of visualizing information, similar to "outlines". It's like a tree, with branches spreading in all directions from a common center. The principle is simple, however many people (like me) like to work with mind maps. Mind mapping has been made famous by Tony Buzan, who, as far as I know, also owns the trademark. Especially if you're a consultant or a creativity nerd, those people just love this kind of stuff.