I wouldn't suggest "What Sticks" as a valuable read for everyone. To be completely honest there are people that this book would do little or no good for. It also reads somewhat like a text book, so if that isnt your style it may not be a good fit. That said "What Sticks" is a great overview of Marketing, so much so I wonder how long before it becomes the standard for Marketing 101 or 102 courses.
A while back Seth Godin wrote on his blog about how little value there was in formal education for the Marketer. After reading this book I'd have to agree (sadly) particularly as someone who has completed almost all of my lower division undergrad work on the subject. "What Sticks" is a practical guide on the importance of data in the advertising field. "What Sticks" offers legitimate mesures to show ROI improvements or lack there of. It also gives insight into where advertising and maketing money is wasted. How and why brands are miscommunicated. "What Sticks" goes to the next level in explaining how to use data to resolve these issues. In the end, "What Sticks" is about communication. In reality, all marketing is about communication and better communication should always be the goal.
So who should read "What Sticks"?
Advertisers, Marketing Managers, Sales People, Coordinators, Leaders, and any one that needs to communicate to groups large enough where it is impossible to know the whole story.
In short, it was interesting, heady, challenging, and a very good book.
(As all suggestions by Robert have been)