Cristian wrote the post I was thinking about. There have been a few posts in the Italian blogosphere, sparked by an article (in Italian) written by Vittorio Zambardino, a journalist, about aggregators and how they are presenting all posts at the same level while newspaper and regular web sites are presenting news according to their relevance.

Choice of sources is obviously what makes aggregators better today, but this doesn't mean that there could not be an improvement in the way news are presented. I like my "river of news" style of reading but I had to separate sources in different groups to be able to handle them, and I'm reading some groups (mostly bloggers) much more frequently than others. A system which would allow me to mix again these sources but still let me find interesting stuff easily while scrolling very long web pages full of posts and articles would make me happy.

OPML reading lists could be a very important part of this application, knowing who's reading what in our trusted network is one of the keys. Other elements to be weighted in the equation could probably be which links we click, what do our friends write about and, of course, what do we write about on our own blog.