collaborative mindmap site - very cool. Limited tools in free version, and only allowed a few maps. But right now you can get a edupersonal year for $30 which I think is well worth it. It is a very cool tool
An online diagramming software perfect for classroom collaboration and project work.
With the Creately's Team plan students can create shareable project folders in Creately and collaborate on all kinds of visual graphic organizer templates as well as mindmap, fishbone diagrams and other class assignments.
This is the most amazing collaborative tool I've seen. Mindmaps and images and files and sharing and an education discount if you find you really like it and use up your 3 maps in the free version.