One cool thing that you could easily do with a Instiki wiki is use it to run a wiki in your classroom, off the teacher's desktop or laptop (can you run Ruby on a Pocket PC? It'll work off your phone in a few years...). Anyhow, without bothering your school or district sys admin. Of course, you can do this with any open source wiki or weblog, but Instiki is an unusually simple and (so far) well behaved server.[by way of...Tuttle SVC]
Tom Hoffman points to this very interesting wiki and it was a snap to install. His idea of a teacher installing this on his or her classroom machine is something I plan to share with my teachers when they return to school next month.