A few weeks ago I was talking over my P.hD research with Graham Cray, and he recommended this book to me. I have finally gotten around to start reading it, and have to rave about it here.
It takes a multidisciplinary approach in exploring consumerism, from neuro-linguistics, economics, social anthropology, metaphysical philosophy, semiotics etc. One of the most standout chapters for me is Chapter 2, "I shop therefore I know I am", exploring the security and meaning consumerism provides (ontological and epistemological analysis).
If your looking for a readable and serious read on consumerism, you might enjoy this book, especially as a follow on to "The Rebel Sell".