EDUCAUSE has a 2-sheet pdf on the above, check it out if you want to find out more about wiki. 8 ways of using wiki(s) are highlighted:
1. Student journaling
2. Personal portfolios
3. Collaborative knowledge base
4. Research coordination and collaboration
5. Curricular and cross-disciplinary coordination
6. Conference and colloquia website/coordination
7. Syndicating/Aggregating web resources
8. Inter-term project management