Gene Zelazny responds to Tufte on the famous Minard graphic - Extreme Presentation
Making Powerful Presentations - Gene Zelazny - Wharton School of Business 2001 (better audio) - YouTube
Columbia Business School Public Speaking Association: McKinsey's Presentation Guru, Gene Zelazny, delivers on 3/2/10 a Presentation Skills Workshop with Crayons and Lollypops