This research from South Australia looked at the ways wikis can be used as a collaborative tool by teachers to store, harvest and share corporate knowledge and in what way can class wikis be used effectively in different subject areas.
There is an explosive growth in these tools and this page aims to provide an overview of some of the most interesting examples that are relevant to education.
Education students at Flinders University have been investigating web2.0 tools and how these can be used to enhance learning and teaching.The site provides an excellent overview of many free web 2.0 tools for teachers and students.