I\'m starting a project using a Restful architecture implemented in Java (using the new JAX-RS standard)
We are planning to develop the GUI with a Flex application.
I've been working on an open source replacement for the HTTPService component that fully supports REST. If interested, you can find the beta version (source code and/or compiled Flex shared runtime library) and instructions here:
http://code.google.com/p/resthttpservice/