Note: many HN-ers don't post on their blog much, but they leave comments here on Hacker News.

This site converts HN comments into an RSS feed:

http://hnapp.com/

Example URL:

http://hnapp.com/?q=author%3Ajohn-tells-all

I subscribe to about a dozen HN people via RSS. Very often they comment on articles I haven't seen yet. Or, people whose ideas I respect have interesting takes on HN articles.