Coase’s Penguin author Yochai Benkler turns his considerable analytical talent to the commons-based peer production of educational materials. Very readable and with great examples, Yochai describes why projects like wikipedia succeed and projects like wikibooks fail. It all has to do with the minimum work unit that can make a meaningful contribution to a project. If a meaningful contribution to wikipedia takes 10 minutes, but a meaningful contribution to a textbook requires an hour, more people will participate in wikipedia. It sounds like the commons-based peer production of learning objects is in, and the open source, distributed production of textbooks is out. Great, clear analysis.