[mod_python] mod_python as xml-rpc server

After much fighting to get mod_python working with a xml-rpc handler 
I've sort of figured out some things that together seemed to help me. To 
use xmlrpclib with mod_python to create a xml-rpc server it's best to 
use a 3.x version of mod_python and to install sgmlop because expat 
doesn't seem to work. Just thought I'd share in case anyone else has 
similar problems.