The journey is still going on, the porting still happening. So what happens when the you need to setup up an autoloader so that you can remove all the include, include_once, require, require_once calls in the different classes.
It is also necessary in cases where you need to instantiate a class based on a combination of data items. The first thing about the autoloader is that the file name must follow the Zend naming convention, the filename must be the classname.php (even the case matters here).
The second item to note is that the classes must be located in the include path, which must be defined in the bootstrap
The Zend_Session is also a beast which has a lot of configuration each time is used. The approach that we used was a Singleton wrapper class which carries out the configuration, and provides access to the session variables starting with the class at http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/
More on our experiences later