My only previous knowledge of wikis came from using Wikipedia. This encyclopedia is a great help to a reference librarian, even with the caution that comes from knowing that it is not an authoritative source. For this assignment, I enjoyed looking at wikis that were used for subject guides and book reviews. Using a wiki for patron book reviews seems like a great way to get them involved in the library, while providing a service for other users.
The wikis used for conferences or meetings really provide on the spot information for the participants. What's great about those wikis is that the information is provided by participants who may not be organizers of the meeting. They may have great tips that would otherwise not be available to all the participants without the platform provided by the wiki.
The drawback of wikis is the opportunity for misinformation. If a library uses a wiki, I would think that there would have to be individuals who would have to keep track of the postings to try to minimize problems.