With more information about his upcoming PHP patterns book, Jason Sweat has posted this new item on his blog today:

Last night I sent my chapter on the Specification pattern in for layout. This passes the > 50% mark for chapters through editing and off to layout as well. The chapter is an evolution of some early work I did with the Specification pattern in this thread.

He also includes the table of contents, detailing which patterns are going to be in the book - including: ValueObject, Singleton, MockObject, Observer, Decorator, and ActiveRecord patterns...