I am all about students collaborating. I think it's one of the most important parts of education. Kids need to be able to learn to work together and share ideas, as it's part of their future when they graduate and move into their adult life.
Realtimeboard is another tool that provides collaboration options. It is free and can link to google. You, as the teacher creates a board and invite kids to access it. They also upgrade teachers to PRO for free. (Follow this link)
This site is set up a lot like ConceptBoard, which I showed in a previous post. It's collaborative, uses invitations to access boards and is easy.
I can see this working in a project based learning setting. Students can conduct their research and use the site for a final project. Maybe a history related search or a biography project. It is also a way to organize yourself. There are several mind mapping methods and organzining tools. When you create a new board, you see several templates that can be used for different things.
It could also be used for a foreign language classroom to make vocabulary boards. Kids can locate images of vocabulary and the shared boards can be used by the teacher as a review tool.
The possibilities for this program are endless. There are a lot of things that can be used in the classroom.