Harry Fuecks has been hacking on my XML-RPC library, and has released a new version with some significant changes. His article on phpPatterns describes the changes and provides a link to download the updated code. He’s made a bunch of interesting architectural changes which take advantage of a number of useful PEAR classes, including HTTP_Request which provides support for proxies and authentication, two frequently requested features.
I don’t know when I’ll get a chance to look at my version of the code again, since most of my current development work involves Python rather than PHP. If you’re looking for an updated version of the library you would do well to check out Harry’s enhancements.