We uses the Zend XML-RPC server component from the Zend Framework. I personally didn't want to focus on the XMLRPC protocol but it's been easy to add this server and it seems to works well. All XMLRPC fans are welcome to test it.
Note: at this moment the number of Moodle web service callable functions is very low, but we are focussing on their implementation from now.
Web services
Moodle 2.0: XML-RPC server
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