If you're a fan of the Git version control library and have been wanting to work with your Zend Framework applications in it, Matthew Weier O'Phinney's blog has a post you should read. He's worked up a method to clone the Zend Framework repository in a Git instance.
I've been using Git for around a year now. My interest in it originally was to act as a replacement for SVK, with which I'd had some bad experiences (when things go wrong with svk, they go very wrong).
He steps through the full process, providing a basic introduction to cloning in Git as well as how to define the correct settings in Git's config file to grab the latest version from the Zend Framework site.