Intentional data, and book sales

I wrote about intentional data the other day. Here is a small example I have just come across. Tim O'Reilly is talking about Asterisk, an open source PBX solution. he wonders why it is not more discussed.

It seems a bit like the early days of things like Perl and Linux, when they were happening under the radar, known to all the hands-on practitioners in the industry, but not covered much by the mainstream press.
Book sales are similar too :-) For the 15 months since it was published, Asterisk: The Future of Telephony has been #12 on our list of O'Reilly bestsellers. So like Perl and Linux before it, Asterisk is getting uptake ahead of its recognition by the mainstream. [O'Reilly Radar]
Sales data tells a story.

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