But, the article seems to be describing something else.
Today k-Collector would not be possible. That alternative future where everyone started blogging and putting their content in RSS2.0 feeds that we could analyse to connect those conversations did not happen.
I honestly didn't understand the article. I gathered that he created some kind of tool that aggregated blog posts based on their tags and created an RSS feed out of that, maybe like delic.io.us did? But isn't that already being done by the RSS readers? So, I still think I don't understand the article.