I've actually always had comments on, but recently switched to a CMS I wrote myself. I haven't had time to implement comments yet, but it's on the todo list. :)
Good to hear. Might I suggest linking to the HN discussion in the mean time (and/or wherever else it's discussed)? Your essay/blog is well-written and valuable, but comments can add at least as much value, and not everyone who visits your site will know to come here.