Tim O’Reilly Has Posted some data on downloads versus sales of the book Asterisk: The Future of Telephony, by Leif Madsen, Jared Smith, and Jim Van Meggelen, which was released for free download under a Creative Commons license.
“we saw a huge spike in downloads starting at the beginning of this year, but didn’t see a corresponding drop in print book sales, other than the continued slow erosion that’s typical of books in print (especially one that’s heading towards a second edition.) However, we did see the book’s first fall from grace, dropping from an average run rate of about a thousand copies a month to about six hundred back in March 2006 coming at about the same time that we start showing the free downloads, but we’re not sure whether or not that is just because we don’t have earlier download data — we believe that the book was available online sooner after publication even though Jeremy didn’t start his mirror till March.“
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