Here is a big WordPress ping list which will ping all these websites when you make a post in your WordPress based blogs. You need to log in to your WordPress admin panel , go to settings and under the writing tab enter this list to make sure all your latest blog posts are instantly indexed by different search engines and you get quick traffic.
By default wordpress sends ping to http://rpc.pingomatic.com
- http://xmlrpc.blogg.de/
http://api.moreover.com/RPC2
http://www.a2b.cc
http://api.feedster.com/ping
http://api.my.yahoo.com
http://api.my.yahoo.com/ping
http://api.my.yahoo.com/RPC2
http://bblog.comping.php
http://www.bitacoles.net/ping.php
http://blogbot.dk
http://blogdb.jp
http://www.blogdigger.com
http://blogmatcher.com
http://www.blogpeople.net
http://www.blogroots.com
http://www.blogshares.com
http://www.blogsnow.com/ping
http://www.blogstreet.com
http://blog.goo.ne.jp
http://bulkfeeds.net
http://coreblog.org/ping/
http://www.lasermemory.com
http://mod-pubsub.org
http://www.mod-pubsub.org/ping.php
http://www.newsisfree.com
http://ping.blo.gs
http://ping.bloggers.jp/rpc/
http://ping.cocolog-nifty.com/xmlrpc
http://ping.feedburner.com
http://ping.rootblog.com/rpc.php
http://ping.syndic8.com/xmlrpc.php
http://ping.weblogs.se/
http://www.popdex.com
http://rcs.datashed.net
http://rpc.blogrolling.com/pinger/
http://rpc.pingomatic.com
http://rpc.technorati.com/rpc/ping
http://rpc.weblogs.com/RPC2
http://www.snipsnap.org
http://thingamablog.sourceforge.net/ping.php
http://topicexchange.com
http://www.weblogues.com
http://xping.pubsub.com/ping/
http://xmlrpc.blogg.de
http://rpc.pingomatic.com/
http://www.a2b.cc/setloc/bp.a2b
http://api.my.yahoo.com/rss/ping
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.blogpeople.net/servlet/weblogUpdates
http://www.blogroots.com/tb_populi.blog?id=1
http://www.blogshares.com/rpc.php
http://www.blogstreet.com/xrbin/xmlrpc.cgi
http://blog.goo.ne.jp/XMLRPC
http://bulkfeeds.net/rpc
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.bitacoras.com
http://www.popdex.com/addsite.php
http://rcs.datashed.net/RPC2
http://www.snipsnap.org/RPC2
http://topicexchange.com/RPC2
http://www.weblogues.com/RPC/
http://xmlrpc.blogg.de/
http://1470.net/api/ping
http://api.moreover.com/ping
http://www.blogoole.com/ping/
http://www.blogoon.net/ping/
http://ping.amagle.com/
http://ping.blogmura.jp/rpc/
http://ping.exblog.jp/xmlrpc
http://ping.myblog.jp
http://ping.weblogalot.com/rpc.php
http://rcs.datashed.net/RPC2/
http://trackback.bakeinu.jp/bakeping.php
http://ping.blo.gs/
To setup this ping list
Go to Settings > Writing > Scroll Down > Update Services
You may interested in how to submit your RSS Feed contents to RSS Feed directories.
Hope it helpful.
Comment me if you have more ping urls.