Wikis

I like wikis and have used them in my high school classes for a variety of group projects. One thing I've done with a general bio class is to assign each student a topic of review for an exam. I make a page for each of them to edit in advance and they have a rubric of what is expected for the page. On the due date, the entire class reviews each page and then we can add to it as needed and get an active review while peer editing for each other. I've had some interesting results with this and am going to use it again this year to review for our final exam.