Thinklinkr is a free service for collaboratively creating outlines. Users can invite collaborators to join into the outlining process at any point in the process. When you’re done creating your outline you can embed it into your blog or website. People who have used NoteShare will notice that Thinklinkr has some interface similarities. As far as outlining programs go it’s good, but it doesn’t do anything other than outlines.
http://www.freetech4teachers.com/2010/01/thinklinkr-collaborative-outline.html