Everyone who has to present information in PowerPoint should read this book before they use PowerPoint.
Having used PowerPoint for almost 20 years I found that Beyond Bullet Points reminded me of things I am already doing and gave me some great examples of how I can do things better. If you go through this book you should also look at slide:ology.
I really enjoyed the style of this book and found it easy to read.
Contains some great examples of how not to use PowerPoint.