Stixy is a fun and easy way for students and educators to collaborate online. Stixy reminds me of Wallwisher, but has many more options for sharing. Start out with a blank virtual bulletin board. Use the Stixy widgets to add content or functionality to your board, positioning them anywhere. Users can add notes, photos, documents, or to-do items. After content has been added to a board, it can be shared with others of your choosing. Those that have been invited to the Stixy board can be given permission to add content, upload, or edit.
I have not tried it yet. Looks like it might be useful for research. How would it work in the classroom with students? Curious to see what happens to it after the beta run and after they add iPad functionality.