This site is the place where you will find all the information you need about a new service that will maximize the communication between publishers and subscribers. How? Pubsubhubbub can be accurately described as an effective way to connect publishers and subscribers through the web by the use of a simple and open protocol that works as an extension to Atom (and RSS).
Those servers using the PubSubHubbub protocol will be benefited with the chance to be immediately informed when an update on any URL they want to know about occurs. On this site you will have access to a clear overview of how this new and interesting protocol works
One of the best things about this protocol is the fact that it is very simple to get and use and you do not have to pay anything for it. The service is open and anyone that is interested in it can use it by running a hub, and publishing using open hubs.
It is obvious that this protocol runs on the Google App Engine, and will help many users to be highly benefited with its many advantages. The site gives you a presentation you will certainly enjoy, where you can learn about the service in simple terms. Therefore, if you feel that this could be a favorable solution for you give this site a visit at Code.google.com/p/pubsubhubbub and you will not regret it.
Code.Google.com/P/PubSubHubBub In Their Own Words
“A simple, open, web-hook-based pubsub protocol & open source reference implementation.”
Why Code.Google.com/P/PubSubHubBub It Might Be A Killer
This is an interesting solution that will be useful for many publishers and subscribers to maximize their interaction. The fact that it was developed by Google makes it highly attractive.
Some Questions About Code.Google.com/P/PubSubHubBub
What is next? Does it run on other App Engines? 
