Wikispaces: Webpages with many editors
    Samples:
    high school class portfolio
    middle school class collaboration

Jessica's College Examples
   Creativity Wiki http://cep818.wikispaces.com/
   And check out the Wix Page: http://cep818.wikispaces.com/Abstracting+%28Flash%29
   Creative Critical Thinking Wiki http://creativecriticalthinking.wikispaces.com/