On the ZendCasts.com site today, they branch out from just talking about Zend Framework-related topics and take a look at he Slim micro-framework in this new screencast.
He introduces the framework as a light-weight, easy to use tool that doesn't include "all of that extra stuff". He walks you through the creation of a (very) simple site that includes some basic templating too. At the end of the screencast he hints at the next part of the series - creating a simple JSON endpoint as a RESTful web service.
You can find out more about the Slim framework on its site that includes documentation and a PHPDoc generated manual for every part of the code.