information overload

Does anyone know any better ways to optimally receive your feed from the blogging world?

Here are my desired features:

* collaborative filtering: give a high score that were rated highly by people similar to me.
* keyword filtering: show articles that match my keywords e.g. if there's something on the news about my hometown.
* category filtering: besides keywords, the system should know what kind of topic I am interested in. (this is low-priority for me). Given the collaborative nature of this, these categories could get highly specialized in some communities.
* provide exactly as many new articles as I feel like reading (LJ friends list is awkward for this).
* it should know which articles I've read before and give slight priority to recent articles.

Collaborative filtering is yet another case of a technology that's been around, but not implemented (or at least, not applied as widely as it should be). This is an opportunity, people!

I've been waiting for micropayments to come around and change this general situation... but will it ever come? It's had plenty of time...