That said, given how many people do talk about the same topics on various blogs and social bookmarking sites, one thing that reader could add that would be awesome, is a "topic view" that would combine posts from different sources into topic groups to cut down on repetition. For example: if there's a post on Hacker News about Apple cutting off Palm Pre support, I can see the entry from Slashdot, Daring Fireball, Techdirt, etc... all in one spot. That is super-hard to do right, but Google has plenty of smart linguistics experts who can make that happen. It would provide enormous value to me in sifting through my various feeds... much more than all this social networking stuff will.