After participating as a contributor to several wikis in my time, I have often wondered how best to manage a wiki. Of course, the whole point of a wiki is that it is not managed, but if it gets to be too much of a mess, then it makes it hard to find anything and no fun to add new material. This article on the O'Reilly Network first introduced me to the concept of Wiki Gardening. Basically, wiki gardening is the process of refactoring a wiki. The person who conducts these cleanups is called a Wiki Gardener. The idea is that everyone who contributes new content, also helps to garden the wiki. The article also offers other suggestions for maximizing the utility of a wiki. However, I think that important thing is to not stress about the organization too much and just do what works. When something needs to be fixed, it usually sticks out like a weed ;)
java:testing. This scheme helps to prevent naming conflicts and provides a better structure in the index.
While not related to keeping the wiki organized, I do like the stylesheet used by OpenWiki. Often times, wikis look so ugly or overly complex.