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This work describes a design for a quality of service aware public computing utility (PCU). The goal of the PCU is to utilize the idle capacity of the shared public resources and augment the capacity with dedicated resources as necessary, to provide high quality of service to the clients at the least cost. Our PCU design combines peer-to-peer (P2P) and grid computing ideas in a novel manner to construct a utility-based computing environment. In This work, we present the overall architecture and describe two major components: a P2P overlay substrate for connecting the resources in a global network and a community-based decentralized resource management system.