As lean times force businesses to reduce advertising and marketing budgets, more and more companies are trying to develop new clients through word-of-mouth referrals. Jantsch (Duct Tape Marketing) champions such an approach, asserting that many widely referred businesses do very little when it comes to traditional advertising and that happy customers and actively engaged partners account for a great deal of their efforts. According to Jantsch, referral behavior is a primal activity rooted in our survival instinct and satisfying our need to connect with other people and mint social currency. Jantsch offers practical solutions on how to build a powerful referral engine by developing a systematic, consistent, and replicable approach and exploiting content, using social networking, and building strategic partnerships. He illustrates his points with examples from such companies as work clothing manufacturer Carhartt with its Tough Jobs blog; Southwest Airlines, which relies heavily on hiring the right people to be the champions of the brand; and TerraCycle, a recycling company whose nontraditional business practices generated word-of-mouth attention. A swift, appealing read and a thorough primer on the power of letting your products and customers speak for themselves.