I found Pauls blogging about Wikis rather interesting.

Wikis are used in all KLAs and are a good learning tool especially when students want to know about different concepts. Currently in our science methods we have created a wiki that shows different teaching strategies that could be used to help teach students. Everyone has been putting their feedback and edited where needed to perfect the strategy.
Wikis can be used in science when wanting to put up concepts and definitions of words. Everyone can contribute and edit to perfect the meaning of the concept.