Matthew Weier O'Phinney has posted a guide to modules in ZF2 - some helpful hints to get you started writing modules for the Zend Framework 2 to fit into the new architecture.
During ZendCon this year, we released 2.0.0beta1 of Zend Framework. The key story in the release is the creation of a new MVC layer, and to sweeten the story, the addition of a modular application architecture. "Modular? What's that mean?" For ZF2, "modular" means that your application is built of one or more "modules". In a lexicon agreed upon during our IRC meetings, a module is a collection of code and other files that solves a specific atomic problem of the application or website.
He starts with a definition of a module as a reusable, self-contained object that can contain the code for one functional piece of the application (like a "forum" module or "blog" module). He gets more technical with a code-level module example structure and example code for setting up a "blog" module with autoloading and a little ACL. He includes the code you'll need to tell the module manager about the module and a few helpful tips/tricks he's found along the way.