If you're creating wikis for education....
If you're creating wikis for education, a few great and free tools are at your finger tips. Several of us have been using pbwiki.com -- liked by many for its very minimalistic style. wikispaces.com is another tool that is fairly simple in design but adds a bit of functionality with discussion threads. My recent new favorite is wetpaint.com -- a more robust tool that provides several pre-designed templates for user and customization. This tool also includes discussion threads as an option and, if you choose the tool for an educational purpose you can request that all advertisements be removed! A new tool on the scene, Google Groups, seems to offer a similar look and feel as many evolving wiki tools. All great for designing web spaces, developing collaborative sharing spaces, or using in lieu of a Powerpoint!