Padraic Brady has an update about his "Zend Framework: Survive the Deep End" book he's been self-publishing on his site including a change to his current donation set up.
In experimenting with making money (so I can buy that Macbook Pro) I'll be adding some changes to how donations work. One main change is that while the current PDF file for the existing chapters will remain available (including future updates), PDF files covering the entire book to date will only be available to those who donate.
The online HTML-only version of the chapters will always be free of charge, but the PDFs (from here on out) will be for those who donate. He is also considering adding screencasts to the series to provide a bit more interactive feel to the whole Zend Framework topic.