Godin knows his stuff. He created Internet marketer Yoyodyne and sold it in 1998 to Yahoo!, where he is a vice president. Godin delves into the strategies of several companies that successfully practice permission marketing, including Amazon.com, American Airlines, Bell Atlantic, and American Express. Permission marketing works best on the Internet, he writes, because the medium eliminates costs such as envelopes, printing, and stamps. Instead of advertising with a plain banner ad on the Internet, you should focus on discovering the customer's problem and getting permission to follow up with e-mail, he writes. Permission Marketing is an important and valuable book for businesses seeking better results from their advertising. --Dan Ring