At my library, we have a couple of wikis set up. One is basically a transfer of our main service desk manual from paper to online, and the other is Boatipedia, our FAQ. I agree with Carol in that the format works well for our manual, and I also agree with her that I’m not entirely sold on the idea of a FAQ in wiki format, unless the intent is more for the ease of allowing many authorized users to edit it. As Carol puts it, “we really don’t want anyone to be able to go in and change content — do we?”
As for other uses for an internal wiki… I could see myself using a wiki to organize information about our electronic resources, licenses, and contacts. Being able to search across pages to find information and the ability to have input from each of the individuals involved in the process would both be pluses for the format over more traditional paper files and email archives. However, we have paid for a tool specifically designed to do that, which also interfaces with the public side of linking users to the resources, so it wouldn’t make sense to use a wiki instead of or in addition to that tool.