Seth Godin, one of today's most influential business thinkers, writes best-selling books like Purple Cow and All Marketers Are Liars. And in between those annual books, he delivers a daily stream of ideas on one of the world's most popular blogs.

When customers are truly thrilled about their experience with your product or service, they can become outspoken "evangelists" for your company. This group of satisfied believers can be converted into a potent marketing force to grow your universe of customers.