PowerPoint is Not the Problem
http://sociablemedia.com/articles_norman.htm

Norman, Donald A.
Sociable Media
2004

Abstract:

What does one of the world's leading authorities on usability say about PowerPoint? As cofounder of the Neilsen Norman Group and author of the classic The Design of Everyday Things, Don Norman is a strong advocate of user-centered design and simplicity. Surprisingly, Norman disagrees with PowerPoint's most vocal critic, information design guru Edward Tufte.