My answer to Website for the masses! on Ask MetaFilter
You could try building it on top of a wiki engine, like MediaWiki—see my comment on this older question.
This is Website for the masses! by Simon Willison, posted on 14th August 2007.
Tagged askmetafilter, plone, enterprise, corporate, noblog, blog, engine, expression, type, movable, management, content, cms
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