I am also of fan of wikis in Education. Here is a wiki we designed for Francophones in Canada.
Communities can share their information in order to make it possible for francophones to let everyone know they exist. ;-)
Students have been researching information on their community and posting what they have found on the wiki.
www.francopedie.ca It is French only but an interesting resource for schools where they teach French of French Immersion.

Manon
Consultant

I use them all the time. Check out my 6th grade history wikis at http://www.librarybcds.com/HLLC_6thGradeLinks.html.

Kids love to publish!

Wikispaces.com have a wiki that is advertising free for teachers. check out http://www.wikispaces.com/site/for/teachers.
As a school principal I also use private (user name and password needed) wikis for agendas and meeting minutes. This is fantastic as everyone has instant access to the minutes and knows what is coming in the agenda and can add to them if they need to. I then use the notification feature to let me know via email that a change has been made to the page.
Wikis are also a great place to organise school documentation, website addresses etc.
they are a fantastic tool, and along with blogs, my favourite Web2.0 tools for schools.
Cheers, Greg

I first introduced my kids to the power of wikis in my newspaper class. They love the creativity that a wiki offers them and to also realize the potential of other people reading their work. Our newspaper wiki can be found at http://huskypawper.wetpaint.com. I also started two other wikis with my students. Currently they are working on the topic of cyberbullying (http://stopcyberbullies.wikispaces.com) and are conducting interviews of students and teachers about 5 areas of cyberbullying. These interviews will be loaded to the wiki and it should be complete by the end of May. The last and most exciting wiki we are currently working on involves the history of our school system. My students are conducting interviews of past graduates using digital recorders. Some are getting interviews from people who graduated in the 1930's and 1940's. Wikis are a great resource for any oral history project and great way to share stories!! You can check out this work in progress at http://voicesfromtheschoolhouse.wikispaces.com. As you can see me and my students love to wiki!!! This should be completed by the end of May as well.

Erin
Technology Teacher
Alabama

This piece from EDUCAUSE called the 7 Things You Should Know About Wikis might prove interesting as well ...

I started using a wikispace this year (lmaconnections.wikispaces.com)after reading a different posting on the spiral notebook :). I love it and it can really help in many areas:
* leveling the playing field of communication skills (i.e. low readers, writers, etc..)
* communication with parents: showing what we're doing in the classroom, positive feedback, involvement...
* the battle of the "lost" homework or assignment notebook for our more organizationally challenged individuals
* as I am one of those individuals, it helps me manage my stuff from home and school
* saves paper; sometimes we just post assignments rather than use paper
* provides a more real-world context
* provides an outlet for their varied strengths and talents

One of my students started a photo contest (with his own rules) and his friend, who is slightly anti-wiki is finding that he would like to understand how to upload docs so he can post his entries. This was a great way to defeat the "limited-time" monster that curriculum demands sometimes create :).

My students (5th-6th) have done 4 wikis this year and I think each served its purpose. The first one was a culimating project on a study of Frank Lloyd Wright and the book The Wright 3 by Blue Balliett. The second was a project for a research project on Unsolved Mysteries. The third and fourth were used as research organizers for a major grant project.

I've written about the wikis and my students opinions on my blog. You can see our GIANT grant project (under construction til May 30).

I guess I am still trying to see how efficient and effective I am as a wiki user. I belong you see to 20 groups that have wikis.. I read fast as in email, but can get lost in a wiki in a few minutes and spend hours .. it may be that lots of my wiki experience is tied to two hours conference calls as well as the wiki and emails. For me, sometimes, though I LOVE technology, the time is a problem. To explore one of my wikis, try the Teragrid wiki. Or the Supercomputing wiki.

Bonnie

The concept of the wiki enables multiple users to work colloboratively with no restrictions of time and place. I have used wikispaces with different year groups to enable them to continue projects outwith classroom and still be working together. The first wikispace we created was at http://radiohigh.wikispaces.com/ where different groups og children work on their group's wikipage to create a script for their radioshow at http://radiohigh-djs.blogspot.com/. The history aspect on the page enabled me to track their progression from initial ideas to final script. The discussion area also allowed me to give feedback and the chidren to discuss their scripts. The idea of building on this collaborative aspect led to the children's current project of creating wiki areas for the different projects that occur at various stages in the school - http://juniorschool.wikispaces.com/Projects. Another aspect of using the wikipages is to display children's work where it is static rather than moveable in a blog. At http://juniorschool.wikispaces.com/L6-xmas page works as a mechanism to display a story and sound in an innovative way.

Wikis are not just about allowing children in the same class, school to work together. It opens doors for collaborative work with others around the world. One class are currently working on creating a radio show with a school 400 miles away - http://northsouth.wikispaces.com/Show+1.

Wikis looks part of my makeup bag now with many new projects planned for the next session. If you want to read an article about how I use wikis please go to:
http://www.tes.co.uk/search/story/?story_id=2366537. Any questions please give me a shout.

Since I work with 24 classes a week, from Kindergarten to fifth grade, I've been trying to find appropriate ways to bring wikis into the classroom. So far my fourth graders and fifth graders are working on personal narratives in their grade level wikispaces, which are kept private for the moment. The students have been learning how to constructively peer edit and use the discussion boards to explain their corrections and suggestions to one another. The kids are so amped about this that I find them logging in and editing all through the weekend. Each student has their own page.
My third graders are beginning to research endangered animals, and we've assigned each of our chosen animals to their own page. Several students across the grade will work collaboratively to create a comprehensive page about their animal and how it can be protected.
I'm hoping to use a wiki to create a school newspaper, but that's still in the planning stages.

Wikis are quickly becoming one of my favorite Web 2.0 tools -- free (which is a big consideration), user friendly and controllable.