The image above is grabbed from a demo at vimeo of the newly launched MixedInk platform for collaborative writing. More outcome oriented than a wiki, the process allows massive groups to weave their ideas and opinions into a single text. The demo gives a step-by-step explanation and the MixedInk homepage offers basics and a tour, with this introduction:

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!)