This book is great fun. It centers around the idea of the "lifestyle cluster"--that there are people in your community who share your consumption patterns, what you eat, drink, smoke (if you still do!), how you vote, etc. Marketers need to know this stuff in an age of "narrowcasting" so they don't try to sell cruises to folks who can't afford them, conduct NPR pledge drives among people who resist them, hawk magazines to people who won't read them, etc.
Using massive amounts of data the author has come up with 62 of these lifestyle clusters and each of us belongs to one of them, from the richie-rich "Blueblood Estates" (think lifestyles of the rich and famous) all the way down to "Southside City" (so poor even federally subsidized highrises are better off). See where you and your allegedly classless Americans are--and see how many lifestyle options there are for a family living on, say, $40,000 a year. Where you live determines how you live, and vice versa.
There are also chapters devoted to lifestyle clusters in other countries, most notably in Canada. (Note to English Canadians: you don't have to worry about us Yanks imposing our lifestyle clusters on you. You have your own clusters to worry about.)
If you're really interested in this, look up Weiss's 1988 book, THE CLUSTERING OF AMERICA, which is a prequel to this one, and contains 40 lifestyle clusters. (I find 40 clusters easier to get my mind around than 62, frankly.) You can track the USA's progression from a production to an information society, notice which segments are gaining and which are losing strength, where racial harmony has occurred, and so on.
I am sorry that Weiss got rid of the cluster called "Coalburg and Corntown" between the 1988 book and the new one. John Cougar Mellencamp comes from a Coalburg and Corntown (Seymour, Indiana), and I always thought it would make a great title for one of his songs.