I've no idea who (even which party) initiated it, but it was just sort of suddenly awesome. Or maybe it just evolved rapidly under great (civil) leadership and was 'always' there just not so great.
Blog has lots of good stuff too, especially articles on accessibility often do well on HN, since that's something they 'obviously' need to worry about, and actually do & do it well.
Often in comments here too (Robin something is a username I recall) - not the sort of crusty 'what's an HN?', 'you can't do that because the Oracle database on our IBM mainframe doesn't support it' department I might've formerly imagined at all.