The Cluetrain Manifesto discusses how the internet has changed business and how companies need to adapt. It is authored by Christopher Locke, an e-newsletter editor and former consultant; Fredrick Levine, a chocolatier and founder; David Searls, an advertising agency winner and open source award recipient; and David Weinberger, a former comic strip writer and author. The book argues that the internet is not just about information but how information is built and shared. It provides different perspectives on topics like double talk, volunteer slavery, and passion for quality. The reviewer recommends the book for its insights into the changing world of the internet.