Cal Evans has posted a Zend Framework quickie for working with the bootstrap in your application.
I've been teaching a Zend Framework class this week and my students have been throwing all kinds of questions at me. Most recently, while we were discussing creating a Bootstrap class for an application a question came up about the _init* functions.
The documentation talks about the bootstrap loading those init functions, but it leaves out the order they're executed in. Cal did a bit of research and found that they're executed in the order they're created with one exception - if you specify one to run first in the bootstrap constructor.