http://rpc.technorati.com/rpc/ping http://rpc.pingomatic.com/rpc2 http://ping.feedburner.com http://www.bloglines.com/ping http://services.newsgator.com/ngws/xmlrpcping.aspx http://api.my.yahoo.com/rpc2 http://blogsearch.google.com/ping/RPC2 http://rpc.pingthesemanticweb.com/