To begin, if you don’t know what a mind map is, here is the wiki.
Mind maps are great for organizing thoughts… *live* thoughts especially. This point was really driven home when one of the founders of the Austin Film Festival (Barbara Morgan) said she created a mindmap at the beginning of every project and used it in her brainstorming sessions. It is an excellent tool for capturing ideas before they disappear behind the next thought, and quickly grouping ideas to get a better sense of the bigger picture.
I’ve done mindmaps for interactive projects, risk analysis, brainstorming, life goals (put your name in the center), things to pack, things to make, pros/cons… all kinds of stuff. Just stop before you start introducing Gantt elements to the spiderweb of tasks… mind maps can only take you so far into a project.
And remember, a mind map is to be seen, not filed away. Display it prominently, add to it, cross things out (don’t erase–>an idea always has possibilities) let it live through the project with you.
Looking for mind mapping software? I do not particularly want to endorse one mind mapping program over the next, so I will let you do your own search (but there are many that are free out there!). I do believe the best way to mindmap is by hand (so you can doodle while you document!), but that is not usually the easiest way to inclusively document in a tech meeting nowadays.