Check out the mind mapping software at
http://www.mindjet.com This is the software recommended by Tony Buzan of "The Mind Mapping Book." I've converted almost all my course notes over to mind maps. It makes everything seem much clearer.
The software has colors, symbols, and all sorts of goodies, and you can convert the mind maps to a web pages if you want to make them accessible to others. They will give you a 50% discount if you are associated with an academic institution.
I have no association with Mindjet, except being a very happy customer.
