A mind map can be defined as a diagram that represents ideas, tasks, or other items linked to and arranged radially around a central key word or idea. Mind mapping can be used to generate, visualize, structure, and classify ideas, and as an aid in study, organization, problem solving, decision making, and writing.
Its a really great tool to use if you want to map out the structure of a book or a seminar you are preparing or to organise a special event.
Free mind mapping software is available such as Smart Draw and Mind Meister. The latter is really cool as it is an online product so you can work on it with members of your team wherever you are located.