As he (Aaron Wormus) mentions in this new blog posting, the PEAR book from Packt publsihing has officially been released.

This is a collaboration between Stoyan Stefanov, Stephan Schmidt, Carsten Lucke and me. The original book was conceived way back at IPC2k4 so it's been in the pipeline for a while now.

Aaron talks about the contents of the book too - the different aspects of programming with PEAR with a more "solution-based" perspective (versus just dumping all of the information in your lap and shoving you out the door). He's also created an unofficial community wiki for the book to give things like reviews, comments, and other book-related things a place to live.