Robin Good developed a mind map of the best online collaboration tools from 2009 using mindmeister.com. Each item on this mind map is linked to the website for the collaborative tool. Enjoy!!! This is the best set of resources in one place I have found.
For those of you familiar with the software Inspiration, this is a web version with some of the same options. This is a mind mapping tool that helps you "capture ideas, organize information, collaborate and share your work, and create diagrams.
This is an excellent collaborative brainstorming tool for creating a mind map. This could be excellent for PreTraining or for a graphic organizer. Imagine your class having this open while you present key information, and they create their mind map of your concepts.