A waste of money
I bought the Cognitive Style of PowerPoint by Edward Tufte because I had enjoyed his earlier books and it came recommended by Kottke (although now that I reread that post, it's just a mention). It was a disappointment. Tufte spends 24 pages talking about why PowerPoint is a terrible medium and how it supports flabby thinking. I've known for years that PowerPoint is a terrible medium (often) and flabby thinking is a universal constant. Save your money and don't buy the pamphlet.