Wikis, Nings and Google Sites have great potential for a class to create online material together that they can share. In my experience, students are pretty good at creating websites and will choose this as a way of presenting their research. The teacher Google sites link was broken, but I found another link that had a good overview of uses.
I've also used the small groups feature of Edmodo to allow particular groups of students to work together on a project, and I think I would now incorporate Google Docs also to allow them to create material in this environment.
