Stephen Kosslyn has written a wonderful book for all presenters: Clear and to The Point: 8 Psychological Principles for Compelling PowerPoint Presentations.
The subtitle for the book promises to illuminate the psychology of PowerPoint. Does it deliver?
In a way, yes. The 8 principles, dozens of examples, and hundreds of tips reveal much that would improve your PowerPoint skills.
However, this book delivers so much more. The 8 psychological principles can be applied to many aspects of public speaking beyond PowerPoint design.