App Engine Recipe - XML RPC server using Google App Engine: "XML RPC server is a very popular way of exposing an API to your website. XML RPC server can run standalone. On a past website project I got it running inside Apache so that it could run alongside the main website. (For XMLRPC server in Apache - check my post http://jyro.blogspot.com/2007/11/xml-rpc-server-inside-apache-modpython.html)
Implementing the XML RPC server is very easy.
First download Julien Oster's standalone XML RPC server from http://www.julien-oster.de/projects/xmlrpcserver/
It is a single xmlrpcserver.py file that you will find inside a tar.gz archive. Just copy the file to your Google App engine project."
