I got a lot less out of this than I did from The Visual Display of Quantitative Information, which is to say still a fair amount. I thought it was an enjoyable read nonetheless and certainly worth spending a few evenings on. The main thrust of the book seemed to be that it's important to show the reader information in a way that maximally enhances their understanding. Beyond that there's a list of examples of what to do and not do, and I'll remember those down the line when I'm looking at or making pictures.
Hardcover, 151 pages
Published Jan. 4, 1998 by Graphic Press.