Pinging
The Wordpress Codex keeps an list of update services, and DailyBlogTips.com has an extensive ping list posted as well.
Don’t know what a ping is in this context? Wikipedia defines it best:
"In blogging, ping is an XML-RPC-based push mechanism by which a weblog notifies a server that its content has been updated."
Those servers will, in theory, create a list of blogs with new content. As I understand it, though the information may be out-of-date, wordpress will automatically ping when it has new content EVEN IF IT IS& SCHEDULED FOR PUBLISHING AT A FUTURE DATE. According to MaxBlogPress, the ping command sends a link to your homepage each time you edit a post even if it has not been published yet.
MaxBlogPress Ping Optimizer claims to manage all this pinging in a better way. I can’t attest to that but I do like that the plugin logs all its pinging activity for you to see.

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