Realtime Board is a new service that provides users with a Whiteboard like page for sharing ideas, and collaborating on projects. It is highly visual and allows you to place comments pictures, diagrams, documents, or notes onto an expanding board and then share this with team members. When you are ready you can use Realtime Board to create a presentation of the ideas controlling what your audience sees in a manner not unlike Prezi.
Realtime Board integrates with Google Drive providing easy access to your documents and allowing you to edit them with ease.
Realtime Board should work nicely in a classroom setting allowing students to collaborate ona project from anywhere and having the results available to all over the internet or via the Smartboard. It is presently in a Beta version and is free.