On the Zend Developer Zone there's a new tutorial showing you how to integrate your application with Flickr with some help from components in the Zend Framework.

Like many Web 2.0 applications, Flickr exposes its data to the public via a REST API, making it possible to develop customized applications that run on top of the base service. This REST API allows access to a number of important functions, including photo searching, tagging and uploading; photoset retrieval; contact retrieval; and panda recommendations.

The tutorial uses the Zend_Rest_Client component of the Zend Framework to make the actual request to the Flickr API and you'll need a API key/shared secret to be able to use it. The rest of the tutorial is code dedicated to helping you connect to the service, fetch data, search the API (and output the results), and looking at some of the "interestingness" magic Flickr has to share.