The Economist has a great ediorial advocating a market in organs:
Kidneys are the subject of a quietly growing global drama. As people in the rich world live longer and grow fatter, queues for kidneys are lengthening fast: at a rate of 7% a year in America, for example, where last year 4,039 people died waiting. …if just 0.06% of healthy Americans aged between 19 and 65 parted with one kidney, the country would have no waiting list.
Read the whole thing here.
Read lots about Virginia Postrel's kidneys here.