Robert Basic has put together an ever growing list of tutorials and other resources related to the Zend Framework (including several Twitter users to follow).

Besides the official documentation and the Quickstart, there are many useful resources for Zend Framework, like blogs and Twitter. I did my best to collect them. If you know something that’s not listed here, but should be, please leave a comment and I’ll update the post.

He has three categories right now - blogs of well-known developers of the framework and outspoken proponents of it, Twitter users you can follow that talk about/might help with issues that could come up and some of the books that have been published on the topic. There's also an "Other" category with mentions of IRC channels, the ZF wiki and the ZF forum.