I really like the interface and options at wetpaint, one of the free wiki-hosting companies. Like most free services, they embed ads on pages that you create. Except now, if you create an education-based wiki with them, you can email them and they'll remove the ads! Visit http://www.wetpaint.com/category/Education--Ad-Free for more details. They say:
Who qualifies for an ad-free wiki?
The following uses of education wikis qualify for ad-free status:
- Middle/High School, University, and Grad School Classrooms (ages 13+)
- Group projects and assignments given by a teacher as part of a class curriculum
- Dissertations, portfolios, and other displays of students’ work in school
- Wikis created by educators to connect with parents
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