Site Ping Service is a site that provides a service that will inform the new update a website or blog. Here is a list of sites that use ping service for promotional campaigns and blogs:

http://rpc.pingomatic.com

http://1470.net/api/ping

http://www.a2b.cc/setloc/bp.a2b
http://api.feedster.com/ping
http://api.moreover.com/RPC2
http://api.moreover.com/ping

http://api.my.yahoo.com/RPC2
http://api.my.yahoo.com/rss/ping
http://www.bitacoles.net/ping.php
http://bitacoras.net/ping
http://blogbot.dk/io/xml-rpc.php
http://blogdb.jp/xmlrpc
http://www.blogdigger.com/RPC2
http://blogmatcher.com/u.php
http://www.blogoole.com/ping/
http://www.blogoon.net/ping/
http://www.blogpeople.net/servlet/weblogUpdates
http://www.blogroots.com/tb_populi.blog?id=1
http://www.blogshares.com/rpc.php
http://www.blogsnow.com/ping
http://www.blogstreet.com/xrbin/xmlrpc.cgi

http://blog.goo.ne.jp/XMLRPC
http://bulkfeeds.net/rpc
http://www.catapings.com/ping.php
http://coreblog.org/ping/
http://www.lasermemory.com/lsrpc/
http://mod-pubsub.org/kn_apps/blogchatt
http://www.mod-pubsub.org/kn_apps/blogchatter/ping.php
http://www.newsisfree.com/xmlrpctest.php
http://ping.amagle.com/

http://ping.bitacoras.com

http://ping.blo.gs/
http://ping.bloggers.jp/rpc/
http://ping.blogmura.jp/rpc/
http://ping.cocolog-nifty.com/xmlrpc
http://ping.exblog.jp/xmlrpc
http://ping.feedburner.com
http://ping.myblog.jp
http://ping.rootblog.com/rpc.php
http://ping.syndic8.com/xmlrpc.php
http://ping.weblogalot.com/rpc.php
http://ping.weblogs.se/
http://www.popdex.com/addsite.php
http://rcs.datashed.net/RPC2/

http://rpc.blogrolling.com/pinger/

http://1470.net/api/ping

http://www.a2b.cc/setloc/bp.a2b

http://api.feedster.com/ping

http://rpc.technorati.com/rpc/ping

http://rpc.weblogs.com/RPC2

http://www.snipsnap.org/RPC2

http://trackback.bakeinu.jp/bakeping.php

http://topicexchange.com/RPC2

http://www.weblogues.com/RPC/

http://xping.pubsub.com/ping/