http://www.longtail.com/the_long_tail/2007/10/everything-in-t.htmlFrom 2007 but a great little article nonetheless.
And for those who say that this avenue is only available to artists at the head of the curve, such as Madonna and Radiohead, I'd point out that the other group poorly served by the labels are those at the bottom of the curve, the many thousands of bands who fall below the radar of the hit-driven majors. I'd argue that they, too, have nothing to lose by letting their music go free, nothing to lose but the prospect of becoming indentured to companies stuck in last century's model of monetizing music.
Well put.