Mind maps are cool. They provide a very good overview of quite complex structures and things. You may quickly scan the mind map and find interesting relations. Also it helps to create/maintain good picture of the process/structure in your head.
Agile development processes are good candidates for mind maps.
This mind map represents Scrum checklist (PDF). Looks neat and focuses on right things like Definition of Done, correct roles definition,etc. In short it is a mind map of best practices in Scrum.
Small Lean mind map. Interestingly, I did not find any Kanban mind map. Seems like it is time to create one :)