But the 3rd best-selling title was Professional Android 2 Application Development, so that's certainly a factor.
Not going to spend the time to ferret out all the "recently published" for 2010, but I do not remember any notable PHP books - published. Granted, there were some, but they do not appear to be offering anything not already in existence, especially for a now mature platform.
Though, the decline of Objective C despite all the new titles might indicate that the iOS platform has peaked for now.
(edited to add: is the canonical source of this kind of data)
The report would have at least some use if it accounted for the freshness of titles (given the short snout of sales), the number of titles published in a year, and the title efficiency.
(Then again, I've made this criticism year after year, so I've come to take the report as chartjunk with slightly better data than TIOBE.)
Since Java is still the main language for the JVM, I am not surprised that Java books are still popular even though the language is getting long in the tooth.
I keep thinking of Alan Kay's claim that nothing significant has been invented in computer science in the last 30 years (since 1980): http://stackoverflow.com/questions/432922/significant-new-in...
[1] http://radar.oreilly.com/upload/2011/02/prog_lang_tree.jpg
I'm sticking to dead trees for technical stuff.
(Novels, biographies etc on the other hand are great as ebooks)
