Michael Dowling tipped us off to Guzzle, a RESTful web service client framework that lets you build testable web service clients quickly and easily.

Guzzle helps you speed up the process of creating a RESTful web service client by giving you full control of HTTP requests and access to advanced features like persistent HTTP connections, parallel requests, exponential backoff, over the wire logging, MD5 validation, cookie jars, and a caching forward proxy.

Installing the framework is as easy as grabbing the phar archive and including it in your application. Some sample code examples are included right on the front page - a simple client pulling down an XML file, grabbing Amazon S3 content, working with the HTTP request on a finer scale and making parallel requests.