If I could subscribe to other HN members' posts and upmodded links, I could, in theory be able to preemptively sort the posts that I liked in common with those users. All it would take is a new menu item at the top of the page- called 'peers'. When a HN user posts a link I find most appropriate to my lifestyle, I have the option to subscribe to future links posted by that HN user; all of the links ( or even comments ) of the peers I subscribe to would be listed in chronological order on the 'peers' page.

If a similar functionality was enabled and the link posting member was able to tag the submitted link, I think it would make it more efficient for the subscribing member to get the appropriate content listed first- that is, if the subscriber could choose to subscribe to the links that were relevantly tagged by each peer.

Simply put: if you ( yes you ) submitted a link that was tagged 'emacs', and I had subscribed to your links tagged as such, I would see it listed on my peers page ( likely near the top, even if I missed a few days ). If you submitted a link tagged 'founder inspiration' and I did not subscribe to that tag of yours, I would only see that link on the front page ( if it made it; and I saw it in time ).

Sorta like a collective intelligent RSS feed, hosted on HN!