O’Reilly Radar has posted a feature on programming language trends based on sales of computer books (figures taken from 70% of US bookstores, including Amazon, Barnes & Noble, Borders, and many smaller chains and leading independent bookstores).
The article shows some predictable sales based on new trends and technologies: Javascript books are more popular following the emergence of AJAX, and Ruby On Rails has been growing rapidly over the past year to eighteen months.
