For additional information and free mind map software (personally, I prefer drawing mind maps by hand but know that some folks are very software savvy), please see http://members.optusnet.com.au/~charles57/Creative/Mindmap/ and http://en.wikipedia.org/wiki/Mind_map.
After the initial mind map is drawn, outlines can be built using each major branch as a first level heading. Minor branches become secondary headings, twigs become third level headings, etc.
For additional information regarding building outlines for research papers, see:
http://ask.reference.com/related/Templates+Outline+APA+Style?o=102545&qsrc=121&l=dir (APA Style Outline) and