Copy and past the following list into your Wordpress blog.

http://api.feedster.com/ping 
http://api.moreover.com/RPC2 
http://api.my.yahoo.com/RPC2 
http://xping.pubsub.com/ping/ 
http://ping.blo.gs/ 
http://ping.feedburner.com 
http://ping.syndic8.com/xmlrpc.php 
http://ping.weblogalot.com/rpc.php 
http://rpc.blogrolling.com/pinger/ 
http://rpc.icerocket.com:10080/ 
http://rpc.newsgator.com/ 
http://rpc.technorati.com/rpc/ping 
http://rpc.weblogs.com/RPC2 
http://topicexchange.com/RPC2 
http://www.blogdigger.com/RPC2 
http://www.blogstreet.com/xrbin/xmlrpc.cgi 
http://www.newsisfree.com/RPCCloud 
http://ping.weblogs.se/ 
http://blogmatcher.com/u.php 
http://coreblog.org/ping/ 
http://www.blogpeople.net/servlet/weblogUpdates 
http://bulkfeeds.net/rpc 
http://trackback.bakeinu.jp/bakeping.php 
http://ping.myblog.jp 
http://ping.bitacoras.com 
http://ping.bloggers.jp/rpc/ 
http://ping.blogmura.jp/rpc/ 
http://xmlrpc.blogg.de 
http://1470.net/api/ping 
http://bblog.com/ping.php 
http://blog.goo.ne.jp/XMLRPC