A presentation Kristof Van Tomme gave at the SIGCHI -autumn event. It introduces mindmaps and how one can use Graphmind to build mindmaps in Drupal that are compatible with Freemind. There's also a slide on our Open Atrium feature for Graphmind.
4. A mind map is a diagram used to represent words, ideas, tasks, or other items linked to and arranged around a central key word or idea . Mind maps are used to generate , visualize , structure , and classify ideas , and as an aid in study, organization, problem solving, decision making, and writing. http://en.wikipedia.org/wiki/Mind_map