More does not always equal better. Instead of copying and pasting a long list of URLs to update each time you publish an entry to the blog, you should choose the websites carefully and make sure they are in alignment with the topic of your website.
Some update services specialize in popular news, others work with science related websites, some are in a completely different language. Each will have their own guidelines on which blogs should update them and how.
You can find some general update services that you can notify each time you update your blog. Be careful not to spam them, only notify them whenever you publish new content to your blog, otherwise your blog be permanently banned.
Here are the ones that I validated and have quicker response so you will update your new blog/weblog successfully:
http://rpc.pingomatic.com/
http://services.newsgator.com/ngws/xmlrpcping.aspx
http://api.moreover.com/RPC2
http://api.moreover.com/ping
http://api.my.yahoo.com/RPC2
http://api.my.yahoo.com/rss/ping
http://blogsearch.google.com/ping/RPC2
http://ping.syndic8.com/xmlrpc.php
http://rpc.weblogs.com/RPC2
Better yet:
Do it manually so you won’t be banned and you could save your blog faster:
(Don’t refresh this page after you submit because you don’t want to be banned by the website thinking you are spamming) http://pingomatic.com/
Most people use Ping-o-Matic (http://pingomatic.com/) which, with just one “ping” from you, will let many other services know that you’ve updated. As for why, Ping-O-Matic puts it best (http://codex.wordpress.org/Update_Services)
