This one-day workshop aims to stimulate research on the sharing and reuse of scientific resources in cooperative scientific work. As science trends toward increasing geographic and temporal scales, larger collaborations, and greater interdisciplinarity, scientific resources increasingly need to be more mobile and integrated with computer supported information and communication environments. Sharing, reuse and circulation of resources become a central challenge and critical component of cooperative scientific work. We interpret sharing broadly to include circulating scientific materials in any way that makes them available to other scientists. We include a variety of resources such as data, software, materials and specimens, workflows, technical know-how, clinical and laboratory protocols, and algorithms. We explore a range of sharing and reuse practices past and present, what motivates and limits them, how sharing can be done more effectively, what tools and techniques facilitate or constrain it, and how this relates to systems and science policy.