As technologies to digitize primary source content mature and become better understood, more widely accessible, and more efficient, the volume of available digital content increases and issues of integration and aggregation become more important. Today\'s digitization project managers must give high priority to factors such as reusability, persistence, interoperability, verification, and documentation when planning their projects. Digitization project funding agencies, like the Institute of Museum and Library Services (IMLS) and the National Science Foundation (NSF), must give substantial weight to these same factors when assessing programs and evaluating project proposals. A Digital Library Forum convened by the IMLS and working in collaboration with participants from the NSF\'s National Science, Mathematics, Engineering, and Technology Education Digital Library program has released a Framework of Guidance for Building Good Digital Collections to serve as a resource for practitioners and funding agencies . . .