Thanks to the recent checkin by Paolo, Cook Computing's XML-RPC.net code now works. You can find the assembly code at http://www.xml-rpc.net. Unzip the file in a subdirectory, cd to src, and:
mcs /target:library /out:CookComputing.XmlRpc.dll *.cs -r System.Web.dll -r System.Web.Services
and that's it. There are some demo programs in samples, but they do use System.Windows.Forms, but the code is extremely simple.
I do have a pretty extensive test app I was using with MovableType to do the testing, but a) the code is ugly and b) my blog personal info is embedded in the code...
Good work people!