Here are a couple of links about Mind Maps which I came across when I was researching they are quite interesting. Tony Buzan also has lots of books on Mind Mapping if you are interested in reading up about it. One of the links is controversial if Tony Buzan invented the mind map, it goes all the way back according to this site to Leonardo Da Vinci, sure why does't that surprise us. He is a legend after all. :-)

http://www.michaelonmindmapping.com/blog/mind-map/tony-buzan-did-not-invent-mind-mapping/

http://www.mindmaps.net/history-of-mind-maps