I just stumbled across the The Long Tail - an excellent and interesting journal by Chris Anderson, Wired Magazine Editor in Chief.
His site has a huge amount of really interesting analysis of data as it relates to current business trends particularly with CD sales, blockbuster movie sales and a whole bunch of other neat, interesting and topical stuff.
From the site;
The theory of the Long Tail is that our culture and economy is increasingly shifting away from a focus on a relatively small number of "hits" (mainstream products and markets) at the head of the demand curve and toward a huge number of niches in the tail. As the costs of production and distribution fall, especially online, there is now less need to lump products and consumers into one-size-fits-all containers. In an era without the constraints of physical shelf space and other bottlenecks of distribution, narrowly-target goods and services can be as economically attractive as mainstream fare.