This is an excellent example of persuasive public speaking in a real-world context and of a speaker using a computer-based slideshow to aid a speech.
The footage is a short excerpt from Steve Jobs' Apple WWDC 2005 Keynote in which he is making the case to Apple developers--who had been anti-Intel for years--that the upcoming switch from PowerPC to Intel is a good idea.
Speaker's use of the slideshow: It's a zen thing--Jobs is one with his presentation. He largely ignores it, focusing on the audience rather than looking at the screen.
Slideshow design: The slideshow itself is extremely minimalistic, guiding the audience through the basic ideas of the speech and occasionally showing things that are more easily understood visually than verbally. He uses the slideshow for three things: traffic direction, examples, and building up complex ideas. All visual and textual elements are meaningful--nothing is there 'just because'. Even slide transitions are meaningful. Complex elements such as graphs are built up part by part so that the audience is guided through them. Visual jokes are included, but even the jokes are integral to the meaning of the presentation.
Copyright note: I consider uploading this short excerpt from the WWDC 2005 keynote to be fair use for the purpose of study and comment.
You can find a transcript of the entire speech at: http://news.com.com/2100-1047_3-5748045.html
