Ward Cunningham, the inventor of wiki, has implemented "Smallest Federated
Wiki".
The most important change is that it is not only easy to
edit the content, also forking is considered a natural
part of the workflow.
Besides, I really like the user interface:
Videos:
http://wardcunningham.github.com/
The code:
https://github.com/WardCunningham/Smallest-Federated-Wiki
Not very difficult to install if your Ruby packaging works.
//Marcin
saper@plwiki