Ping service allows you to notify automatically blog directory and search engine when your blog updated. That means the bigger the list the better traffic you will get from those sources. So check out the list below, and include it on your blog(Wordpress User Follow Admin Panel >Setting>Writing).

http://blogsearch.google.com/ping/RPC2

http://1470.net/api/ping

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://bblog.com/ping.php

http://bitacoras.net/ping

http://blog.goo.ne.jp/XMLRPC

http://blogdb.jp/xmlrpc

http://blogmatcher.com/u.php

http://bulkfeeds.net/rpc

http://coreblog.org/ping/

http://mod-pubsub.org/kn_apps/blogchatt

http://www.lasermemory.com/lsrpc/

http://ping.amagle.com/

http://ping.bitacoras.com

http://ping.blo.gs/

http://ping.bloggers.jp/rpc/

http://ping.cocolog-nifty.com/xmlrpc

http://ping.blogmura.jp/rpc/

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://pingoat.com/goat/RPC2

http://rcs.datashed.net/RPC2/

http://rpc.blogbuzzmachine.com/RPC2

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

http://rpc.icerocket.com:10080/

http://rpc.newsgator.com/

http://rpc.pingomatic.com

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

http://rpc.weblogs.com/RPC2

http://topicexchange.com/RPC2

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

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

http://www.bitacoles.net/ping.php

http://www.blogdigger.com/RPC2

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://www.mod-pubsub.org/kn_apps/blogchatter/ping.php

http://www.newsisfree.com/RPCCloud

http://www.newsisfree.com/xmlrpctest.php

http://www.popdex.com/addsite.php

http://www.snipsnap.org/RPC2

http://www.twingly.com/ping

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

http://xmlrpc.blogg.de

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

[via] : DailyBlogTips