First of all, the Wiki is so easy and it has impressed me because my first opinion was low of wiki's only because I am history teacher who discourages Wikipedia. Now that I have had the opportunity to use one and see the applications in action, I cannot wait to involve my students.
I do know that some of my students have their own wiki's and are quite handy with them. They have turned in projects using their wiki and that was amazing to me because most mention using a portion of their myspace to hand in assignments. Myspace, of course, is frustrating to me because if you are not a member you cannot visit some pages or their is always way to much junk to sift through to get to some real content.
So as far as usage in my class, I would set up a site dedicated to what we are studying in class at this moment and create an open invitation for editing with my students. I would ask them to share resources in the form of links and create pages that are associated with our field of study in class. I would caution them from using their real names and to come up with a user name that is unique to them and one that I would know because I know them. I would establish this wiki as a safe place and also make the parents aware of the goal of this wiki.
Information is best shared when the students are involved. I love learning from them and I hope the same holds true in return. A wiki makes is possible from the comfort of our homes.
Class- its share time!