Mind Mapping is a powerful note-taking method. Not only do Mind Maps effectively highlight important facts, but they also show the overall structure of a subject and the relative importance of individual parts of it.
They are great when you need to think creatively, and can help you to make new connections between ideas. This is useful when you have problems to solve.
To use Mind Maps effectively, it's best to print your words, to use different colors (to add visual impact), and to incorporate symbols and images to spur creative thinking.
If you do any form of research or note taking, try experimenting with Mind Maps.