My original plan was to organize things into sequences, but I now think that converting to a wiki/post model (concepts defined in wiki, which organizes posts, which link back to wiki) is an even bigger win, though sequence browsing would still be nice.
Thing is, while I was actually writing all this stuff, I needed to just focus on writing it, as much as possible, even at the expense of usability - and go back and fix the accessibility afterward. It's not optimal but it got the job done.
A big positive here would be the book being published, like the freakonomics blog took off after freakonomics got popular and then they added more contributors who would add research that would be of interest to freakonomics readers.
This has been discussed some, but I don't think it's been the sole subject of a top-level post. I want to find out other people's ideas rather than driving the discussion into my ideas, so I'm asking the question in a very general form, and holding off on my own answers: