Joseph Crawford has a new post to his blog today with a look at his use of the Zend_Rest_Controller and Zend_Rest_Route components of the Zend Framework to create a simple REST service.
You might be asking yourself why do I have to use both components, why is it not rolled into one nice component. The answer is really basic and if you look at the source code for the Zend_Rest_Controller you will see that it is solely an abstract class that defines the methods required for use with the Zend_Rest_Route.
He includes the code to add to your bootstrap file to get the routing working and a sample controller (MyController) that extends the Zend_Rest_Controller and sets up some basic actions - get, put, post and delete. He does mention one issue he's coming across in a feature he's wanting to add - putting the version number of the API in the URL for easier separation.