Weekly roundup: a new Practical series

We're getting to the end of the Practical PHP Testing Patterns series, which followed the Practical PHP Patterns one in exploring by-the-book patterns (by the Gang of Four, Fowler and Meszaros) in their application to PHP code. It all started with the Practical PHP Testing ebook, with a simple tenet: working code sample at the end of each chapter/article.

Since these series have gained the trust of many readers, I'm thinking about a new Practical-branded series. The format has worked pretty well: one small topic treated from theory to code sample, twice a week; the level of views is constant and that tells me there is interest.
So what would you like to see after our joruney in design, enteprise application architecture and testing patterns?

Meanwhile, here are my articles published this week on DZone.
Practical PHP Testing Patterns: Literal Value is the simplest pattern for dealing with example values in tests.
The Kindle is ready for programmers is a review of the Kindle from a programmer's point of view. Some people told me that this article addresses their doubts regarding using a Kindle for technical books.
Practical PHP Testing Patterns: Derived Value describes the practice of generating input or expected values for your tests on-the-fly.
PHPSpec: BDD for your classes is a review of PHPSpec and its approach to Behavior-Driven Development in the small.