This tutorial covers a lot of the basic use cases with Zend_Navigation. Using a uri-based navigation.xml file, we generate a very simple menu system as well as a breadcrumb with some basic information. In the last 3 minutes I cover how to get a Google compliant sitemap from the navigation.xml file. This video is by no means exhaustive, but should get you up and running with Zend_Navigation in the Zend Framework.
On another note, I’m thinking of putting together a forum as a way of organizing some of the informative discussion I’ve found in the comments section. I know other forums exist so I’d be curious to know if you think zendcasts would benefit from such a thing.
Alternatively, if you have topics you’d like covered and are willing to step up to the mic, I’d love to share your own screencasts with the now over 550 subscribers!