This white paper contains a cracking comprehensive review of Open Source Content Management Systems. I have personal experience of Plone and MediaWiki and I can vouch for the accuracy of their analysis.
Open Source Content Management Systems
Joe Drumgoole
Copacetic 
It seems that page ( White Paper) requires user registration. if you go to http://www.optaros.com/en/publications/white_papers_reports, and follow the link, it gives a page where you can register (for free and quickly).
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