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Enterprise-resource-planning (ERP) implementations cost billions of dollars annually in the US alone. Web 2.0 can reduce the cost, improve the quality, and lower the risk of ERP implementations. A case study of ERP implementation communities gathered challenges and requirements for a Web 2.0 knowledge repository system. Epics is a Web 2.0 system that supports knowledge reuse in ERP implementations to fulfill these requirements. A prototype built upon a number of popular open source software packages and deployed in a real-world ERP community shows promising results. In addition to cost savings, interesting business models emerged as a result of the deployment.