The Flat Classroom Project
An exceptional example of a collaborative project that links seven classrooms around the world.

Teacher-Librarian 2.0
Exploring emerging technologies that impact the role of the teacher-librarian.

High School Online Collaborative Writing
Features the collaborative writing of various high school students.

Wikibooks
Collection of textbooks to be edited by anyone.

swarmsketch
Collaborative drawing project where visitors can contribute a single line to a collective drawing.

Westwood Schools
Created by teacher Vicki Davis.

Wikipedia
The online encyclopedia.

Art Appreciation Course
A very active wiki for a college level Art appreciation course out of California.

Canadawiki
The All-Canadian Wiki- Collaborative content creation for Canadians. Everything you'd want to know about Canada.