The "Feedization" Of The Web

I love Google Reader; it is my primary feed reader. However, there are a few things about and every other reader that I have tried which really really bothers me:

It doesn't filter my feeds for me. I have to click through every story on every feed. Otherwise the feed counts go sky high and things get buried. There has got to be a better way.

First of all, I want clustering. If two articles with similar words from two sites about the same topic have a link to the same target, then there is a pretty good chance I don't need to read that story twice. Sort that out for me Google News style :-)

Second, I want to be able to differentiate between "I want to read everything" vs "I like to read these when I have time". Right now, I read EVERYTHING that comes in through Google Reader. When that "inbox" is empty, I hit sites like reddit and HN. I just skim the front page and find some stuff to entertain me. Then, I move on. I do something similar with Facebook feeds, although I sometimes miss feed items from my best friends when I want to see EVERYTHING (or at least all their shares and comments; stuff they want replies to). We need a way for casual-reading style feeds to be integrated with our "must read" feeds.