The 9 at the bottom are the ones that appear to respond successfully to a properly formed ping.
Code:
http://blogsearch.google.com/ping/RPC2
http://ping.feedburner.com/
http://ping.syndic8.com/xmlrpc.php
http://rpc.reader.livedoor.com/ping
http://rpc.technorati.com/rpc/ping
http://rpc.weblogs.com/RPC2
http://services.newsgator.com/ngws/xmlrpcping.aspx
http://www.blogpeople.net/servlet/weblogUpdates
http://xping.pubsub.com/ping/