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Many books purport to teach people how to use the unique and or functional features of various products. Greenspun is honest enough to tell us what doesn't work.
Especially in the fusion of web and database, where product specific overtechnical and underedited tomes teach people to build marginally useful sites handling hundreds of hits per day, Phil has given us a philosophy for designing much bigger, much more useful sites. It's an added bonus that the ideas are expressed clearly enough that they are readable by less technical management, who often believe that if they spend enough money on industry leading products, everything will work wonderfully.