Today Six Apart, the makers of TypePad, released a new TypePad PubSubHubub hub, which automatically promotes blog updates in real time. It's a free feature for bloggers who use TypePad, and it automatically updates Google Reader, FriendFeed, SuperFeedr, and LiveDoor.

It's not even a plug-in, but simply an automatic feature, which requires no changes from bloggers. Although, those using Advance Templates in TypePad will have to add a line of code to their atom.xml, which can be found here.

Pubsubhubbub is described as a "simple, open, server-to-server web-hook-based pubsub (publish/subscribe) protocol as an extension to Atom and RSS." This is a protocol that Google itself has adopted for shared items in Google Reader, which allows it to contribute to real-time search. Google recently provided the following presentation:

"The PubSubHubbub protocol is decentralized and free," explains Six Apart's Nima Badiey. "No single company controls it and anybody can run a hub, ping (publish) or subscribe using open hubs."

"The new TypePad PubSubHubbub hub builds on the exciting work that Brad Fitzpatrick (a Six Apart alum) and Brett Slatkin’s team at Google have done with the implementation of PubSubHubbub," Badiey says.

A lot of blogs are hosted by TypePad, so this could prove to be another big stride for the real-time web, which we hear more and more about every day. That's why real-time search is not limited to tweets and Facebook updates. Content in general is rapidly pushed out from many different media channels all over the web. Freshness can play a big role in some kinds of queries.

Speaking of "real-time," a way to get close to real-time search using Google has been discovered by way of tweaking a URL using a time-related search option. More on this here.