Ask YC: Reading from RSS, keeping track of conversations?

I read all of my Hacker News, Reddit, etc from Google Reader, like many people. Lately I've become more interested in the actual discussions going on within the actual news as they are usually pretty interesting

The problem I encountered though is that I can view comments, submit my own, but then going back to dicussions is kind of a hassle since the stories are gone from my feed, unless I explicitly mark them as unread, but that's kind of redundant

What do you guys do in this kind of situation to keep track of discussion? Almost would be sweet if Google Reader had a seperate active discussions/threads kind of deal :)