http://en.wikipedia.org/wiki/Mind_map
List of mindmapping software:
http://en.wikipedia.org/wiki/List_of_mind_mapping_software
List of concept mapping software:
http://en.wikipedia.org/wiki/List_of_concept_mapping_software
How to MindMap:
How Mindsmaps can help you learn a language:
http://www.youtube.com/user/fmonteroarranz