It’s funny, yesterday I was thinking of why push techniques aren’t used to communicate between blogs. Then today I read this.
My idea was that blogs could have a list “friends” who are allowed to ping them when they have updated content. Just like blogs now ping weblogs.com for example, using XMP-RPC or REST. It would create small mini-Technoratis all over the blogosphere. So instead of a blog having only its own content it could also have a “buzzing in my network” page. What’s nice with the RWW article is that it reminded me of the Jabber protocol. That could be even more interesting to use in a one-to-many push call. So thinking a step further, why not use(extend?) the protocol to enable features similar to those in site-bound social networks like MySpace, Bebo, Facebook and Twitter. Like display online status, what I’m doing right now and so on.
Every blogger is master of his/her own blog, so there wouldn’t be any privacy issues, just only publish what you are comfortable with. There are millions of blogs, why not network them blog-to-blog?

Update: Through a comment on RWW I found out that this already exists someone is working on something similar.

Update2: The ISS thing seems more focused on messaging. That is not what I’m talking about here even though communication of course would happen through some kind of messages. Tell me if my idea isn’t clear or what you think of it if it is for that matter.