I didn't notice this reddit link go by last month, since I don't check my referrers as often as I used to (heh), linking to my post about teaching things other than trig.
All in all, I feel like I fared well for a site like Reddit, but there was one repeated theme in the comments I wanted to address: The idea that economics would be impossible to teach in high school. The argument was that economics is hard in the sense that true understanding requires advanced math, that economics is controversial in the sense that there is no one accepted theory of economics, and that having a partial understanding of economics could even be worse than no understanding at all in some cases.