REST
REST Server
A REST Server is now available for the Services module, so that external REST clients can communicate with Drupal Services. In order to use the REST Server, you have to install the Zend Framework.
simple REST server?
I've got a project where I am integrating Drupal with a third party service (a video upload/transcode/hosting provider, kind of a white-label YouTube: twistage.com)... when something updates at that service they want to ping my server @ a URL I designate with some simple key/value pairs, and I want to act on that ping.
Services seems like a perfect fit, except: a) XMLRPC and AMFPHP seem to be the only servers pre-written; and b) I haven't grokked the server part of the services equation to author what seems like a super-simple server - one that only responds to $_REQUEST variables.

