Update Services are pinging tools that easily update our blogs. WordPress notifies this popular update services to updated our blog by sending XML – RPC Ping service. Its updated each time when we create and update the post.
XML-RPC Ping Services are,
http://www.blogstreet.com/xrbin/xmlrpc.cgi
http://bulkfeeds.net/rpc
http://www.feedsubmitter.com
Alternative Ping Services are,
For More information about update services Check out here – http://codex.wordpress.org/Update_Services