slide:ology: The Art and Science of Creating Great Presentations by Nancy Duarte

This is a great book with a lot of useful information on how to create powerful presentations for different situations and audiences.  I like the fact that it show examples from simple presentations and illustrations to those for complex stories.  Some of the case studies are particular useful for me because they remind me of some presentations I have created over the years, and now I have realized how wrong they were.  There are also details in the book about color matching, 3D object creations, visual effects, and diagram creations.  I read the book twice and still getting new ideas from the book.  This book is certainly a must for professionals.

The only thing missing, I think, is a quick presentation slide in the book to show people that PowerPoint is not meant for documents.