Minmaps are easiest way to orgnize your thoughts and share knowledge. Thanks to my ex-collegue Ramesh for introducing me to this new concept few years back which comes very handy even today.
Mindmaps can be used for both personal and professional purposes. Here is a mindmap which I liked very much and found at http://www.mindmeister.com/ . This is a mind map about how to win friends and influence people-a book by Dale Carnegie. Image source/owner-Mindmeister