I heard about wikis several years ago, but I honestly did not know what they were or how they worked. I assumed that, like Wikipedia, they were large repositories for professional communities.
After watching the Richard Buckland video, I now have a better understanding of a wiki's use. I believe that wikis can serve a valid and valuable use for an educational classroom. Buckland teaches at a University, so his students are much mature than the 14-15-year-olds that I teach. What he does in his courses, however, should be easily adaptable to any post-secondary school.
In a high school setting, I need to be much more cautious. I am dabbling with the idea of trying a wiki in one of my business classes. The business students are more responsible and seem to take more pride in their work. However, I will not have one ready for testing until after spring break (March 14-18).