Tim O’Reilly published his analysis about the market of computer books’ sales.
With this kinds of trends you can have a feeling about what leads in the market categories and what doesn’t.
I’m not surprised seeing Ruby (+53%) ahead of Python (+37%) and Perl (-21%), nor to see how books about the web design and development are on the edge. What surprised me most is seeing a +106% regarding SQL Server (!!)… it should be connected to the spread of .NET (that has surpassed Java).
Nice to hear Mac OSX books sale is the only positive trend 
