tonez323,
I just finished (tonight) PR and activating a book on mind mapping that I can recomend. I suggest
The Mind Map Book by Tony Buzan and Barry Buzan. (ISBN 0-452-27322-6) It is very comprehensive. The information on computer-generated mind mapping is outdated, but otherwise it is quite good. I read it as my book for the 5-day photoreading challenge. It was good enough that I wanted to read every single word, but I stuck to superreading and dipping. That worked!

Darrell