Weekly roundup: hardware design vs. Continuous Integration

I'm taking a course in ubiquitous computing where we are studying hardware design. It's interesting how a common methodology reminds me of waterfall - each phase from the behavioral specification to the logical synthesis (where you decide how many and, or and not to use) contains a thorough verification step.
The reason is simple - the last phase, the actual production of a custom integrated circuit is very costly (hundreds of thousands of Euros). So iterating a design including this phase is not possible at all.
In software, it's a bit different. We can afford a dedicated server that builds our application dozens of time each day.

Here are my original articles published this week on DZone.
Practical PHP Refactoring: Consolidate Conditional Expression is about extracting code from conditionals and applying polymorphism when possible.
What I have learned at DDD Day is about my experience at a conference on enterprise software, mostly oriented to .NET.
Practical PHP Refactoring: Consolidate Duplicate Conditional Fragments is about avoiding duplication even in ifs.
OAuth in headless applications explains how to access Facebook, LinkedIn and other Apis when the user can't continuously authorize your application.