Here are some examples of Educational Wikis

Keystone Technology Conference
Wiki used to catalog all training done at the 2009 conference

perkupprojects.wikispaces.com
Ideas to perk up your projects using Web 2.0 tools

techtoolsforreading.wikispaces.com
Using Web 2.0 tools for reading

wahs-reading.wikispaces.com
Teacher created website to assist students with reading strategies

mybiologyspace.wikispaces.com
Simple teacher created wiki regarding Biology

mrsmaine.wikispaces.com
Teacher page for classroom management