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2010 State of the Computer Book Market, Post 2 - The Categories
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In this second installment (the first post can be found here), we look at computer book sales in specific technology categories. Remember that we've organized the data into six "Category Families" — Systems and Programming, Web Design and Development, Business Applications, Digital Media Applications, Consumer Operating Systems and Devices, and Computer Topics. Within each of these Families are category group, super-category, category, and atomic category, in a five-level hierarchy. For example, Systems and Programming includes the category groups programming languages, databases, software engineering, general programming, security, and so on. In the rest of this post, we will contrast the final quarter of 2010 with 2009 as well as the whole year of 2009 with 2010.

As a refresher, here is a new treemap of the

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