What Is PubSubHubbub?

PubSubHubbub is a simple way to let people know in real-time when your blog is updated. PubSubHubbub is quickly gaining adoption and is already being used by Google Reader, Google Alerts, FriendFeed and more.WordPress Plug in: http://wordpress.org/extend/plugins/pubsubhubbub/ Another Plug in is PuSHPress: http://wordpress.org/extend/plugins/pushpress/