Seth Godin stands conventional wisdom on its head:
The Prius was developed after the marketing thinking was done. Jones Soda, too. In fact, just about every successful product or service is the result of smart marketing thinking first, followed by a great product that makes the marketing story come true.
This makes quite a statement about the inherent value of products and services. Is something only ever as good as we are convinced it is? Is perception now 110% of reality?