A lot of very salient thinking on books, metacognition, double-loop learning and the deliberate design of new forms by Andy Matuschak.
I've been thinking of doing a talk about how to get the most out of your reading both quantitatively and qualitatively. Many people do not even know how much is possible, let alone that they would have an inkling of how to get there. I think anybody can easily get to at least a doubling of reading quantity and conceptual retention.