Ask HN: Resources for becoming a better teacher?

I am considering a teaching position for a code school, after already teaching once before. Students are generally pretty smart, and there is already a substantial amount of learning resources online for the material at hand. However, I still feel like I'm winging it with my teaching skills.

Are there some recommend resources for educating adults, particularly the kind you'd find attending a code school? I'd like to learn some core concepts of education that would improve my approaches.