Here's my current list:

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

http://api.feedster.com/ping

http://api.moreover.com/ping

http://api.moreover.com/RPC2

http://api.my.yahoo.com/rss/ping

http://bblog.com/ping.php

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

http://blogdb.jp/xmlrpc/

http://bulkfeeds.net/rpc

http://coreblog.org/ping/

http://ping.bitacoras.com

http://ping.blo.gs/

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

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

http://ping.fakapster.com/rpc

http://ping.feedburner.com

http://ping.syndic8.com/xmlrpc.php

http://ping.weblogalot.com/rpc.php

http://pinger.blogflux.com/rpc

http://pingoat.com/goat/RPC2

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

http://rpc.britblog.com

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

http://rpc.pingomatic.com/

http://rpc.tailrank.com/feedburner/RPC2

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

http://rpc.weblogs.com/RPC2

http://rpc.wpkeys.com

http://topicexchange.com/RPC2

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

http://www.blogdigger.com/RPC2

http://www.blogoon.net/ping/

http://www.blogpeople.net/servlet/weblogUpdates

http://xping.pubsub.com/ping

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