XML-RPC.NET is now updated to version 0.4.0. This contains classes for implementing both XML-RPC clients and services.
This release has only been tested with .NET beta 2. I'll upgrade to a release candidate build of .NET as soon as possible but there should not be any major changes because of this.
I'm still working on a suite of unit tests so this release is still at the "alpha" release stage.
The release contains a sample XML-RPC service to be run in the IIS web server and a couple of WinForms samples, one to call the sample service and the other to call the Betty server at Userland.