Tim Bray – PubHubSunday:

"I see PubSubHubbub, as much as anything, as an attempt to capture Twitter’s pattern of information flow in a reproducible, interoperable way.

[…] Hooking up a publishing system to the PubSubHubbub machinery is damn easy; I know because I just did it. You have to put <link> element(s) in your Atom feed pointing at one or more hubs that will be aggregating you. Then, when you update your site, you need to ping the hub(s) using HTTP POST."