XMLRPC (Useful Inc.) -- http://xmlrpc.usefulinc.com/ XMLRPC-EPI (Epinions) -- http://xmlrpc-epi.sourceforge.net/ *PEAR::XML_RPC (Shane) -- http://pear.php.net/package-info.php?pacid=17* SOAPx4 (now NuSOAP, D. Ayala) -- http://dietrich.ganx4.com/soapx4/ XMLRPC-EPI (Epinions, encoding only) -- http://xmlrpc-epi.sourceforge.net/ *PEAR::SOAP (Shane) -- http://pear.php.net/package-info.php?pacid=87*