I've been playing around with the Zend Framework and the Google API. I'm pretty bummed out that there doesn't seem to be any API for Google Reader. I was hoping to use Zend_GData_Query to suck in my starred and/or shared feeds. You can do this using getFeed() but I wanted to include the tags I've put on the entries. But I don't see my tags anywhere in the data, only the original "category terms" if specified by the feed author.
I even tried to do a login authorization with Google using Zend_Gdata_ClientLogin, but the public and private Google Reader URIs threw a hissy fit on me.