Hard to tag this one. I didn't use the 'book' tag because the headings are mostly independent. You can click on any chapter or section and get some insight.
As well respected as Minsky is (and deserves to be), and as widely read as this book is, no one really went anywhere with it. As far as I know, there is just AMBR and its descendants, and they're not as exciting as one might hope. AI isn't a humble discipline, but all of its successes have been with more humble problems. Grand theories sketched out in advance do more harm than good; they don't help with the nuts and bolts, they give the impression that we understand much more than we do, and then people rightly ask "so where are our minds-in-a-box?"