A Small Business Guide to Wikis
Mashable has posted this article: http://mashable.com/2009/10/04/business-wikis-guide/ as a small business guide to wikis. They recommend three wiki sites, none of which I have used, but I am familiar with one. The one I have used is wikispaces and I have found it a wonderful way to organize information that is thematically linked. I would also recommend it, or another wiki site, highly as a way to keep track of changes in a business or a library or even a business library.
Something else of interest that was linked to the article is WikiTag, a technorati for wikis. Not only would this be a good place to list your wiki, it would also be a good searching vehicle in addition to searching blogs and web sites.