My previous post about my LCA mini-conf talk received an interesting comment from Christopher Neugebauer.
He said that he had some trouble understanding me because I speak quickly, he wasn’t the first person to make that complaint (it’s the most common complaint I receive). If a talk goes well then I have a lot to say and little time to say it and end up speaking quickly if I don’t concentrate enough on speaking slowly. If a talk doesn’t go well then I get nervous and speak quickly.
When a speaker talks too quickly it is appropriate to call out a request for them to speak more slowly. I know I’m not the only person who has difficulty in speaking slowly enough and I expect that others also wouldn’t mind such requests from the audience.
Chris suggested giving a talk with a small number of words used on the projector, it’s an interesting idea and may be worth a try. However I have recently watched Lawrence Lessig’s talk published on TED.com  which used that technique, I was disappointed in the result. His talk appeared to be very well received by the audience, I’m not sure whether that is because the audience was less familiar with his ideas than I am or whether it’s a technique that works better for an audience than for a video.
I would appreciate further suggestions in this regard.
Update: It’s interesting to note that Bruce Schneier’s keynote for LCA had no presentation material, he spoke from written notes.