Jessy Devasia also experimented with using a wiki in her class last semester. Here is her note on that experience:
Everyone is welcome to have space on the wiki if you are interested in teaching with it also.
I would like to give you a brief note on my experience with using Wiki this spring semester. I used it for BI0 201, 202, and 204 with moderate success. Initially there was no response from the students. But offering a few extra credits for using wiki did the trick. Some of the students started posting interesting web ites, news items, answers to some of the questions etc. in wiki.
The biggest success was with BIO 204-Microbiology in which we were doing a group project. Students were divided into 12 groups. Many of these groups used to edit their projects in the wiki. They were happy that they need not have to email back and forth all the time.
I plan to use it again this semester right from the beginning of the class. It is easy to introduce new things in the beginning of the semester before the students get too busy with assignments and tests. I would suggest the use of wiki for classes which have group projects, tough lab exercises etc.