Looks interesting and thought some of you might be interested in it too
----- (From the about page)
Connect, collaborate & be heard
MixedInk takes a fresh approach to collaborative writing. It's a fun, democratic and elegant way for people to weave their best ideas together. (Plus, it's free!)
MixedInk is used by students, employees, fans, activists, political & community groups, unions, citizen journalists... pretty much any group with an opinion.
Together, people write op-eds & letters to the editor, text for petitions, mission statements, questions & comments for politicians & stars, news articles, blog posts, and lots more. -----
Check out the demo video to the right of the "tour" tab (no way to link to it directly).