- Make sure to provide a text version of your talk online, in a sane format.
- Keep text off your slides. Use them to show code, or kittens, but not bullet points.
- Remember that you're speaking to an intelligent audience. They'll have more fun if you leave some stuff unsaid, and let them come to their own conclusions.
- Go through the painful process of watching yourself speak on video, to identify and correct the many verbal tics you didn't know you had.
- Have a single shot of booze ten minutes before liftoff