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Re:Who Writes Wikipedia? by vrruiz on Thursday December 23, 2010 @07:05PM (#2036247)
Felipe Ortega wrote a Ph.D. thesis devoted to this topic. "Wikipedia: A Quantiative Analysis", available at http://libresoft.es/Members/jfelipe/phd-thesis His conclusions were featured on a Washington Post article, "Volunteers Log Off as Wikipedia Ages", discussed here http://news.cnet.com/8301-1023_3-10403467-93.html and here http://news.slashdot.org/story/09/11/25/160236/Contributors-...
Re:Who Writes Wikipedia? by Ras_ on Friday December 24, 2010 @08:57AM (#2037246)
Second opinion (with stats) by Wikimedia Foundation Data Analyst Erik Zachte:

http://infodisiac.com/blog/2009/12/new-editors-are-joining-e... (addendum: http://infodisiac.com/blog/2009/12/why-i-changed-the-title-o...)