[j-c-h-e-n-g]

I like Strom Carlson's talk talk at LayerOne back in '08 (pre-social media, pre-Meetup, pre-widespread lightning talks):

"In this presentation, Strom will guide you through researching, preparing, and giving a technical talk to a diverse audience. He'll help you avoid common mistakes, and point out some not-so-obvious mistakes that even the best tech presenters tend to make. If you've never given a tech talk before, this presentation will make it much easier for you to get started; if you're an experienced tech presenter, this talk will make you even better."

https://www.youtube.com/watch?v=_wb2b69JNU8