I tend to keep a pretty short ping list for my wordpress blogs. Here is the pinglist I am currently using as of Augost 2009 for my wordpress websites:
http://rpc.pingomatic.com/
http://api.moreover.com/RPC2
http://api.my.yahoo.com/RPC2
http://bblog.com/ping.php
http://blogsearch.google.com/ping/RPC2
http://rpc.twingly.com/
http://blogsearch.tailsweep.com/xmlrpc.do
http://ping.feedburner.com
http://ping.syndic8.com/xmlrpc.php
http://rpc.technorati.com/rpc/ping
http://rpc.weblogs.com/RPC2
http://ping.myblog.jp/
http://rpc.blogcatalog.com/
http://ping.snap.com/ping/RPC2
http://www.popdex.com/addsite.php
http://www.blogpeople.net/servlet/weblogUpdates
Some people have very long pinglists that tend to gow over time but a shorter one will be more beneficial in the long run since many services overlap and you risk pinging the same several times. Also, take note that http://pingomatic.com/ actually relays your ping to the majority of services on the ping list above.
If you want to be absolutely sure not to duplicate ping, just leave the default ping service http://pingomatic.com/ and only add services that are not listed on their site.
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