This is a pretty cool idea and a perfectly simple implementation. However, I think you're solving a problem that doesn't exist: If I wanted efficiency, I wouldn't be reading blogs and news aggregators in the first place. I come to websites like HN to relax and browse through interesting articles and discussions -- sort of like leafing through a good magazine. If you distill it down to 10 articles then suddenly I'm finished reading and I can get on with my work... Too soon!!!