Since I'm in the process of taking a seminar on "Critical Thinking" which includes things like the Socratic Method and Mind Mapping, I thought I'd share a great Mind Mapping tool that I've discovered. It's called bubbl.us and it's a free online tool that helps you brainstorm ideas and build very snazzy Mind Map charts.
To see an example of a Mind Map, click on the image to the right, which is a map for building a tree house (and also proof that I have no idea how to build a tree house).
The interface is intuitive and Web 2.0ish so can get up and creating within a few seconds. The keyboard strokes are simple and brilliant. Don't expect a whole lot of customization like adding pictures or special icons, just really clean, attractive shapes.
If you want to save your work of mind art, you can register (name, email, password) and then not only save it, but collaborate with others on it. Mind Maps are probably best created in a room with everyone sitting around a screen or whiteboard, but I'm curious to see how this concept translates to individuals collaborating in non-real time.