On the Zend Developer Zone there's a new post from Bill Karwin highlighting the Zend_GData component of the Zend Framework and how it can help grab information from the Google Data APIs.
The recent Zend Framework 1.0.3 release includes new support for some great services, including Picasa Web Albums, YouTube, and Google Documents List.
He talks about the interfaces for each of these (including what you can grab) and includes some pointers to example code that can be used with either the full framework or just the GData bundle. There's also a video demo of the component being used to fetch data from the Data API.