One of the questions that we in the TurboGears community get asked is "How can I have XMLRPC in my TurboGears application?" Until now, we didn't have a useful answer beyond "Write it up". Now we have tgext.xmlrpc.
tgext.xmlrpc allows you to have an XMLRPC hierarchy. Your code becomes a case of simply setting up your controller and working with it like any other controller. So, if you need to have XMLRPC in your TurboGears application, check it out (and don't forget to read the docs!). I think you'll find it quite helpful.