REST Tutorial

Hi, I have started using Amazon S3 for a web application I have been developing. I recently discovered a PHP class (s3.class.php) that helps store, retrieve and delete files on S3.

However, the class does not work well in a few cases. Therefore I thought I'll learn REST so that I can create my own PHP class for interacting with S3 servers.

Does anyone know of a good introduction/tutorial for REST with php examples? I found a good tutorial but it was based on Ruby. Thanks