Federico Cargnelutti mentions in his latest blog entry, a new Zend Framework book has been published (from W. Jason Gilmore) called "Easy PHP Websites with the Zend Framework".
This book embraces a teaching strategy of learning by doing, showing you how to build website features you'll actually want to use within your own websites. Among other things you'll learn how to manage data submitted through web forms, send unformatted and HTML e-mails through your website, manage user registrations, logins, and recover forgotten passwords, and even create the structure for a simple social network.
You can find out more about the book, including where to order a copy, on its website. The PDF version costs only $22 USD and if you want a print version, that'll be $32 USD (for U.S. order only). You can read some of Jason's own thoughts on the release in this blog entry.