I liked this post, but then again, I like all your posts Eliezer! (I've just been hiding behind my feedreader, and so not commenting about it before.)

My opinion about mathy/non-mathy is that you should do what you think is most natural. Most days, you'll probably want to get on with the mathy exposition (and I am very much looking forward to the more advanced mathy posts), and then sprinkle in something lighter when the occasions to do so arise. For instance, I like that you based today's post on a recent discussion you had.

I believe this approach would be most conducive to interesting reading.