This new post on the ServerGrove blog today looks at using the updated Zend_Loader component of the Zend Framework from inside a Symfony application.
Zend Framework 1.8.0 was released yesterday and if you are using it within a Symfony project, you need to know something: Starting on 1.8.0 Zend_Load::autoload() is deprecated and will be removed on 2.0.0.
With the updated loader, if you'd like to use it inside Symfony, you need to change the function you're using to autoload via a call to spl_autoload_register. Point this at the Zend Framework code and you should be good to go.