Ph.D students, who are teaching, must go through an introductory pedagogy course. Even though I have had such courses before, I thought it was a very interesting experience. Not least because the course was both international and interdisciplinary, so everybody had a nice opportunity to meet with graduate students from diffent fields and cultures. Turns out that every Ph.D student teaching at a university level, pretty much faces the same difficulties, regardless of subject.
The course ended with all participants writing a short treatise on a pedagogical issue they are facing themselves, and possible solutions. I wrote about using kinesthetic (that means something you do with your body) exercises in physics teaching. It was quite fun to write, and I think it actually turned out ok. You can read it here