Over on the Zend Developer Zone today, Akash Mehta has written up a review of a book from Packt Publishing, "PHP Web 2.0 Mashups" (by Shu-Wai Chow):

As it's title suggests, PHP Web 2.0 Mashup Projects is a demonstration of the various techniques available for developing mashups in PHP. Through a highly practical format, Shu-Wai takes the reader through a series of projects utilising different web services and APIs, while carefully exposing the reader to a wide variety of technologies and data formats.

With careful selection and shaping of language, the book is an extremely effective introduction to the world of mashup development with PHP.

Akash talks about the contents of the book (the different projects it covers) and how the book provides a version useful resource to those just getting into the mashup world - a reference guide to some of the popular data transfer methods/formats out there.