The two wikis I chose to review were http://desbuffalo.wikispaces.com/ (Mrs. Koopman's classroom) and http://wikiwonderful.wikispaces.com/ (Mrs. Hopkin's classroom).
I liked that both of these wikis has explanation links explaining what a wiki is, how to edit pages, when to edit pages, and other "wiki rules". At the elementary level (wikiwonderful being a 2nd grade wiki), it is safe to assume this is one of the first times these students (and their parents) will have seen a wiki. By clearly posting the wiki rules and how to's, the teacher have save themselves time and headaches.
The wikiwonderful wiki had a page for everything from a place for students to write stories, to monthly themed poetry and book chats, to a page for their class pets, and links to several class projects the students were doing. The teacher also used this wiki as a class photo album of sorts with a page for each class activity (which I think is fun idea!). I love that on this wiki I could see lots of student work and evidence of student contribution. I found this wiki inspiring ... if a second grade teacher can do this with her second graders, then I need to get on it with my fourth graders!
The desbuffalo wiki seemed to be a wiki used more by the teacher for instruction. This wiki also had pages for everything - from writing and literature to simple machines and the Civil War. However, on this wiki I saw less evidence of student contribution, and more signs of the teacher using the wiki to give information. There were some links to message and discussion boards where students could contribute, but I didn't really see that the students were actively involved in the wiki itself. This is away to use a wiki that I really hadn't thought as much about. While I like having the student contribution more, I do think wikis would be a great way to give information as well -- and I may have to play with ways to combine the two ideas!
Overall I found both these wikis great examples to go through! It is wonderful to see the ways other teachers are using technology tools.
If you are looking for a list of great sample wikis, here are two awesome lists that I found the wikis I reviewed on: http://wikiswork.wikispaces.com/Examples+of+Elementary+Classroom+Wikis and http://elementarywikis.pbworks.com/w/page/18744756/Examples%20of%20Elementary%20Wikis