I find this statistics to be interesting because technically, outside Android, there's probably not too many new books about Java published by O'reilly unlike in the early 2000 when Java for the web and enterprise exploded.

On the flip side, Head First Design Patterns, Head First OOP, Head First Software Development are all using Java and the Head First series seems to replace the "For Dummies" series for beginner's book (don't get me wrong, I love Head First series because the series attempts to write book from a different angle and it does make sure you remember what you read, just like in the classroom).

Last but not least, O'reilly has the best selection of JavaScript books out there compare to other publisher.

[edited typo :)]