On the KillerPHP.com website, there's this new post starting off a new series (by Jonathan Lebensold) talking about the different components of the Zend Framework.

When Stefan asked me to write about the Zend Framework, I decided I would avoid copy-able code, simply because it doesn't re-enforce good software design. [...] The following is a brief summary of 4 components in the Zend Framework: Zend_Loader, Zend_Log, Zend_Config and Zend_Registry.

For each of the four components, he looks at how they can be used (reason why), some good and bad things about them and he includes some pseudocode to show the format for its use.