I absolutely love comments on HN and they are probably the main reason I read this site a lot. Some times, the posts themselves are quite self-explanatory from the title and I just go straight to the discussions.
I created a little site called HackerNews Club
Where you can easily search for user's submissions and comments. FYI, here's Dan's comments :)
http://hackernews.club/luu#search/52e35e01f172df6d183c59633c...
And HN users ordered by the number of comments they have made.
http://hackernews.club/#search/39a2159841122c713bf4324d6f9de...