I have been working on an open-source XML-RPC Client for ActionScript. I’ve had code done for a few weeks now, and I’ve finally finished the basic documentation, so I’m ready and anxious to get some feedback from anyone who is interested. The way you use the library is based on the design of the Flash Remoting ActionScript 2.0 components, so hopefully it will be familiar/easy to learn.
Please try it out, and give feedback!
More information and a download link is on my XML-RPC client project page.