You may have seen Wikipedia, the online encyclopedia. One of the things that makes it interesting is that anyone can edit it without needing to know a great deal about creating web documents.
Wiki software may have great benefits for anyone wanting to write collective documents. Parliament for instance!... An idea that is being addressed with experiments occurring in a number of different locations around the world (for more information see this link). This may aid the development of laws if this type of system was utilised in the democratic process, adding to transparency if everyone could view the development of documents on-line. People may then contact their MPs to suggest amendments!