As customers grow more powerful, the automotive industry is forming new relationships with its suppliers. Business-to-business (B2B) commerce over the Internet is breaking down the traditional hierarchical relationships. The supply chain is being transformed into a supply network or a supply community, with the potential for a seamless flow of information between customers, manufacturers, suppliers and partners in the automotive supply chain. Already, hundreds of B2B Exchanges are in operation. The largest vertical exchange, COVISINT, an Internet marketplace for the automotive industry, recently received approval from the US Federal Trade Commission and the German Bundeskartellamt. It seeks to develop a community of trading partners that focuses on the acceleration of the build-to-order and the product development processes of its customers as well as reducing the costs of doing business. The exchange is building a progression of services: procurement, supply community management, and collaborative engineering. The article focusses on the management aspects of this. Some companies may need to rethink their business models. (3 pages)