There are a large quant of information technologies related books which doesn’t contain really valuable information. One book just tells us about software user interface (I can see and investigate that interface myself on the monitor), another one just retell software product documentation (I can read that doc myself again).
“WordPress Plugin Development” book is made by another author and from another material. First of all it is fresh edition. Book is published in 2009. The author of this book Vladimir Prevolac (http://www.prelovac.com) shares with us its own rich WordPress plugins development experience and uses real plugins code as the examples to comment through which he lead a reader from the first page to the last one.
The author goes together with you from very simple basics to more complex things. He explains in details the programming technique and WordPress secrets. Do you wish more? JQuery and AJAX are covered in parts which used in the those plugins too.
It is recommended to read this “WordPress Plugin Development (Beginner’s Guide)” book for every person who decided to develop his own WordPress plugins. You may be sure – it is right place to start.