This document summarizes a presentation on supporting digital scholarship through digital libraries and online communities. It discusses the importance of community engagement for the viability and sustainability of digital libraries. Subject-based repositories have generally been more successful than institutional repositories due to stronger community orientation and participation. The document outlines the life cycle of online communities and factors for success. It also examines improving value propositions for stakeholders and understanding target audiences. Finally, it discusses how repositories may evolve into a global ecosystem and how digital libraries can incorporate more social web approaches to shift away from just collections toward community-centered services.