Matthew Weier O'Phinney as a new post to his blog today looking at a few "do's" and "dont's" when it comes to working with module boostraps in your Zend Framework applications - an apparently somewhat confusing topic for several developers out there.
In Zend Framework 1.8.0, we added Zend_Application, which is intended to (a) formalize the bootstrapping process, and (b) make it re-usable. One aspect of it was to allow bootstrapping of individual application modules -- which are discrete collections of controllers, views, and models.
He talks briefly about why module boostraps are run on every request (getting into some detail on Zend_Application), how you can properly set up your boostrapping process and how you can use plugins to initialize only the things you might need and, as he openly admits, that there's just not a really good way to handle this sort of module funcionality.