If you are interested in learning more about applying common design patterns to your applications and are able to understand German, we have good news for you. Your first chance to get information about pattern driven development from the Stubbles developers is the International PHP 2007 Conference in November, where Frank and I will be giving a half-day workshop on PHP Design Patterns. As Frank wrote last month, we are also giving some more 1-hour talks at this conference.
Your second chance to learn more about design patterns is the new German professional PHP training organized by Wolfgang Drews. The course consists of 12 different sessions, I'll be giving the talks about OO developement and PHP design patterns. Other trainers include Christian Wenz, Tobias Schlitt, Kore Nordmann and Tobias Hauser. The best part about this course is, that is an online training and you do not even have to leave the house. More information can be found at the course website or Wolfgang's blog.
If you prefer to read or cannot afford any of the above options, there still is my book PHP Design Patterns published by O'Reilly.