In cooperation with NPR News, This American Life considers the explosion in health care costs in a first-time-ever two-part series.
The first week, "More Is Less," covers rising costs.
The second week, "Other People's Money," takes on the insurance industry--in a very entertaining hour. (In fact if you listen to just one, this is the one.)
And they do a nice job of getting at the source in nearly every case: fairly basic micro-decision-making based on the incentives and institutions at work.
So have fun listening as NPR spreads the blame around. Both may be streamed for free by following the links above.