More recently, I've started watching and deconstructing Lessig's TED talk with my Art & Media Ed students (most of whom are becoming teachers) in order to better understand the power of Lessig's approach. We also review the critiques of PowerPoint put forth by Edward Tufte, Sherry Turkle, and David Byrne.
As a point of reference, we view Peter Norvig's PowerPoint reworking of the Gettysburg Address. If you haven't seen it, Norvig's presentation translates Abe Lincoln’s moving 1863 cemetery speech into a series of six generic slides featuring bullet points, bland colors and a nearly incomprehensible ‘Organizational Overview’ graph. It clearly illustrates some of the profound limitations of PowerPoint as a communications tool.
In contrast, Lessig uses visuals (and selected text) in a way that truly compliments and extends the conceptual/pedagogical aspects of his presentations. As Chris Tunnell has pointed out, the multiple slides, repeating images, and minimal text allows the audience to focus on, enjoy (and presumably remember) the material being presented. This is further enhanced by the logical (e.g. 3 stories and an argument) and sometimes poetic (e.g. "the refrain") structures that Lessig uses to organize his talks.
real time presence to Google Docs presentations as well. Now, when editing a presentation with a co-editor, you can see which slides he is editing, and if he is editing the same slide, then you can see which element -- text box, shape, image, video, etc -- he is editing.