[pmdf]

Mind maps are one of those things that really make sense when you actually start using them. Since I started I find I use them for all sorts of things, from early stage project planning tool through to taking notes in meetings - a visual outliner really. I use MindNode Pro which is cheap and very basic, but I find that the lack of complexity is a real benefit as I like to keep my maps simple and focused. I haven't yet used them as part of my core GTD setup though - I'll have to think about that one.