So my current passion is combining non-formal visualization like mindmapping with UML ! And my tool "astah*" is about that.
I just uploaded a 1-min video that capture the concept of converting mindmaps to usecases.
And also, I'm an Agilista and a 2008 Gordon Pask Award Recipient for Contributions to Agile Practice. In that context, I uses mind maps to capture user wishes so to create later user stories. I talked about this concept at Agile2008.
"Exploring user wishes through mindmapping"