In case this helps anyone get noticed more, here is a list of services I am currently was pinging:

http://api.feedster.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://ping.bitacoras.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://rcs.datashed.net/RPC2 euro.weblogs.com

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

http://rpc.pingomatic.com/

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

http://rpc.weblogs.com/RPC2

http://topicexchange.com/RPC2

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

http://www.blogdigger.com/RPC2

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.lasermemory.com/lsrpc/

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

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

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

http://www.snipsnap.org/RPC2

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

http://xmlrpc.blogg.de/

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

Update: Updated list, thanks to Elliott.

Update2: Updated again, now up to 41.

Update3: Updated again, now up to 43. Please note, use these services responsibly. When I started this page I was pinging ALL of them (25 at the time). I now ping about 30, all of which are topical and relevant to me. You may also want to consider simply using Pingomatic for your pinging needs – which will speed up your posting if you’re having issues.