The Zend Developer Zone has posted a review of a new book from Packt Publishing that introduces you to the Joomla! content management system and how to create your own bits of functionality for it - Mastering Joomla! 1.5 - Extension and Framework Development.
Planning to write a few extensions for site's I host I was looking for a book that could at least in part be a replacement for this documentation. As I went through the site of Pact publishing My eye fell on this particular book because of the example chapter they show. And indeed now I have the book I'm in no way disappointed.
He mentions the target audience of the book (and how well it hits it), the approach the book takes to the topics it covers and specific looks at several of the chapter topics like web services, error handling, security and plug-in structure.