A wiki (wiki means “quick” in Hawaiian) is a collaborative website and authoring tool that allows users to easily add, remove and edit content. Wikipedia, a collaborative online encyclopedia, is the largest and perhaps the most popular wiki.
Wikis, like other web 2.0 tools are very easy to set up and many libraries are using wikis to create subject guides, pathfinders, conference sites, procedure manuals etc.
Pbwiki and Wetpaint are software freely available for creating your own wikis.
Here is a link to my wiki and a link to other successful library wikis