"The model aimed to rationalize several puzzles observed in the industry, such as why Red Hat, a high-quality firm, contributes significantly more to Linux than any other firm and why a market with mandatory sharing can actually produce higher-quality products than a proprietary market."
I'm hearing more and more good stuff about Behavioral and Brain Sciences.
Joe Reagle had some good criticism that are worth checking out as well.
This write-up up some pretty awesome longitudinal research has come highly recommended.