not really, I will just soak in all the comments on topics I find interesting and by repeatedly clicking comment threads to topics I find interesting, I kind of do that automatically, I guess. The HN people tend to repeat the same sentiment over time for each new link on a certain topic, so much even, that it is easy to assume what the top 5 comments will be, haha. however, sentiment can change over time. and sometimes a comment is so poignant or interesting that it will just stick in my brain immediately.