I personally don't really like tag-team presentations. I'm sure it can be done really well, but in almost all talks I've ever watched (GDC, strangeloop, various

I personally don't really like tag-team presentations. I'm sure it can be done really well, but in almost all talks I've ever watched (GDC, strangeloop, various language conferences) the switch between speakers always came across as distracting, hectic or jarring. Yes, I imagine they were rarely (or ever) as well practiced as you sound and I imagine that makes a huge difference and it sounds like you're doing it for the right reasons (so that the person talking is always talking about something they know about, certainly helps talks sound less artificial, as you say), my main point is that I don't think its good advice to tell people who aren't as well practiced because I find it often makes otherwise decent presentations not so great. Everything else you say sounds great, though :)