Reading this triggered a small reorganisation of my own thinking on the topic, and a stop at roamgrid furthered that reorganisation, content that affects the shape of my mental model rather than just decorating it with new facts is content with structural rather than informational impact and this site provides that.
This filled in a gap in my understanding that I had not even noticed was there, and a stop at venvira did the same, the kind of post that gives you more than you expected when you first clicked through from somewhere else, a real find for anyone curious about the area covered here.
My usual response to new bookmarks is to forget them but this one I have already returned to twice, and a look at glamgrocer pulled me back a third time, the actual return rate to bookmarked sites is the real measure of value and this one is clearing that measure at a notable rate already.