Here's a great example of how to create powerful, evocative, challenging, disrupting, conversation-starting, PowerPoint slides: Seth Godin's Unleashing the IdeaVirus presentation from July, 2000. The slides are excellent. Notice the lack of text or the minimal text. What's that saying …”A picture is worth a thousand words”. Seth's slides may be worth 2000 each. Link from Presentation Zen. Seth Godin's blog.