The 'big board' at the NEIT 2010 UnConference

This picture, by Lisa Thumann, was taken at the NEIT 2010 UnConference. It shows the 'big board' that was used to organize most of the conference. For more on unconferences see: http://www.unconference.net/

I'm looking for an online equivalent to the big board to help organize the Online Progressive UnSchool (OPUS). If you have suggestions please leave a comment.