Seth Godin is the author of 14 best-selling books, writing about the post-industrial revolution, the way ideas spread, marketing, leadership, and, basically, "changing everything." He has been called "America's Greatest Marketer," and his blog is one the most popular in the world. His latest company, Squidoo.com, allows people to build a page about any topic they like to raise money for charity or earn royalties for its members.