They may look like jumbled and messy flowcharts for the insane, but mind maps are actually extremely useful and perfect tools for brainstorming. You essentially take a flow of ideas and translate them into interconnected webs designed to help clarify your thinking (or mind, as it were).
You can use mindmaps also when you organize an event, to make sure that you don't forget anything, e.g. http://gustmeesfr.files.wordpress.com/2011/12/vdujwtjyx3uq-ri20vw-tipmindmap17-apr-09-15-171.jpg It's a mindmap which I used in 2004 already to organize a Theater piece about learning basics of #IT-Security which you can follow here http://gustmeesfr.wordpress.com/2011/12/28/securite-pc-et-internettheatre-interactif-et-pedagogique/
Via Gust MEES