Where is a good starting point for learning the Zend Framework? The introduction from framework.zend.com left me wanting more, and really wasn't enough for me.
I'd say a good next step after reading the introduction, is to try to build a (simple) website with Zend Framework. That's really the best way of really getting to know the Zend Framework better.
Also, you can go through the more extensive Zend Manual.
I originally started with the Akra's DevNotes tutorial way back. The book from Rob Allen, Zend Framework in Action, is pretty good as well if that's an option for you.
Survive The Deep End is a good guide to building apps using ZF. It covers the basic application structure (bootstrapping and configuration) the MVC design pattern, along with all the related ZF libraries (DB, Form, etc).
From the site:
The book was written to guide readers through the metaphorical "Deep End". It's the place you find yourself in when you complete a few tutorials and scan through the Reference Guide, where you are buried in knowledge up to your neck but without a clue about how to bind it all together effectively into an application. This take on the Zend Framework offers a survival guide, boosting your understanding of the framework and how it all fits together by following the development of a single application from start to finish. I'll even throw in a few bad jokes for free.
I also enjoy going to http://www.zendcasts.com/. John puts together some very helpful tutorials on how the framework works.