I do mind mapping extensively, both on paper, and using Mindjet's "mind manager". I use mind mapping to brain dump everything relevant about a project. The free-form approach helps me get stuff down in whatever order my brain decides to bring it to memory. They then get hacked into a logical order, maybe split into separate maps, and get used as an "at a glance" overview, which is great for making sure nothing gets missed during development. Paper is handy for the first cut, or on a bus, in a meeting etc., but the electronic version is better for editing and showing to colleagues and customers.