Anyone who knows me knows that I am a huge fan of open source software. Not only is it typically cheaper (usually free), but many times I find it to be less buggy and provide greater support when needed through forums and discussion boards.
For the reasons mentioned above, I recommend for everyone to give FreeMind a try. This graphical organizer program will compete with the best of them, but I must warn that there is a learning curve. After you play with it a bit, check out it’s help section, which gives all sorts of information related to what you can do with it.