For reasons completely unrelated to the content, Identity 2.0: https://www.youtube.com/watch?v=RrpajcAgR1E Watching that talk brought me over to the "a picture or a few words per slide" style of presentation, rather than the "wall of bullet points" style. It also helped me move from "stop talking, change slides, start talking again", to smooth transitions while talking.
I'm waiting for more people to discover the next level - the "no slides at all" style of presentation. Cory Doctorow did a nice keynote at 28C3 completely without slides, and it worked very well ("The coming war on general computation", https://www.youtube.com/watch?v=yYqkU1y0AYc). Not suitable for every type of talk, of course, but certainly there are many where the slides are a useless crutch or slides-for-the-sake-of-slides. If you're a good enough speaker you can hold people's attention without pointing at large words behind you.
(See Edward Tufte's "The Cognitive Style of Powerpoint" for good arguments about why slides are a bad idea most of the time)