I gave a talk about DANE for SMTP at the ICANN61 conference last week. Audio and slides are available, but not a synchronized recording so if you want to follow along you'll need to figure out the slide transitions from the context of the audio. I was promised 45 minutes, had too much material even for that, but only got 35 minutes, and yet managed to get to most of the key points. I hope and think that the pace was not too fast to get the points across.
My segment starts at 16 minutes into the recording and ends 51 minutes into the recording:
http://audio.icann.org/meetings/sju61/sju61-OPEN-2018-03-14-T1732-208bc-zYhN...
The slides are at:
https://static.ptbl.co/static/attachments/169319/1520904692.pdf
The slides have additional material in the Appendix section. Please take the key rotation advice in the slides seriously and apply it to improve your own practices. May your TLSA records never fail to validate, even briefly...