This PubSubHubbub plugin is a simple way to let people know in real-time when your blog is updated. PubSubHubbub is widely adopted and is used by Google Reader, Google Alerts and many other services.
<link rel="hub" ...>declarations to your template header and ATOM feed
<atom:link rel="hub" ...>to your RSS feeds along with the necessary XMLNS declaration for RSS 0.92/1.0
By default this plugin will ping the following hubs:
Please contact me if you operate a hub that you would like to be included as a default option.