For those of you who remember the chapter on Mind Mapping, or use this in school on a project, here is a free site for concept mapping. Great visual picture tool to help students see "flaws" in their thoughts, gaps in their info, or to show organization to a generation of random access thinkers. However, with anything else, a tool like this often doesn't beat the convenience of a pencil and paper.
It could be a theif of time. I do believe that's why other paid products that do this haven't become so popular. We are playing "Beat the Clock" with every class.
Check it out, if you like!