Wallwisher is a free tool that allows you to create online bulletin boards. Teachers must create an account to create walls, but students do not have to have a wallwisher account or an email address to post sticky notes to the wall.
Use "Fakebook" to chart the plot of a book, the development of a character, a series of historical events, the debates and relationships between people, and so on!
Self Organizing Learning System (SOLE); focus on children driving their own learning through inquiry and discussion with each other; found that children retain more when a group is gathered around one computer, rather than one child at one computer (probably due to discussion)