- Automating Resource Concatenation, Optimization, and Caching
- Zend Server: Not Just a PHP Stack
- App Engine on PHP: An Introduction
- PHP and Varnish: Getting the Best from Your Web Servers
There's also a new column introduced by Aaron Saray talking about some things you can do to remove the fear of "ever showing your code again". You can pick up this issue (the last digital-only one) directly from the [php]architect site.