The Eyes Have It

A slightly dated (PointCast?), but otherwise useful article outlining ways a speaker can prepare for the unpredictable nature of what they do.

Excerpt:

I didn’t care who was responsible. My audience didn’t care who was to blame. All we knew was that there was no picture and it was showtime.

Every speaker is the ringmaster; the person in charge of the event. If something goes wrong with the audio-visual material, it will reflect badly on the speaker. So the speaker must take control of the environment.