WEBSPIRATION

I just heard about http://mywebspiration.com/. When I was in the classroom, I used both Kidspiration and Inspiration...registration for this beta is free!

Collaboration is key to any online tool, and Webspiration allows you to collaborate with anyone that has an email address...similar to using Google Docs. May not be the best brainstorming (free) software for younger grades...maybe 5th grade and up can properly manage and share.