If you would like to create your own mind maps, I recommend using MS Visio. There is a standard stencil in every version called Brainstorming. It can be found in the Business category. I haven’t used any other tools, so I cannot compare it, but it works perfectly. However, I recommend using copy-paste method of adding new concept lines, as the automatic positioning tool is sometimes unpredictible. Anyway, if you plan to start doing your notes as a mind-maps Visio is the tool you need.