In April 2000, the Digital Library Federation commissioned three reports to address broader concerns about digital collections in research libraries. This report synthesizes the nearly 10 years' experience that libraries have had digitizing items from their rare, special, and general collections, and making them available online. The report demonstrates that digitization programs work best where their role within a library's collection development strategy is clearly understood, and identifies several roles that such programs can play. The author muses about the extent to which digitally reformatted special and rare collections can actually support scholarly research, and looks at whether leading research libraries in particular might more usefully focus on digitizing general as opposed to special and rare collections. The report opens with points to consider in developing a sustainable strategy. The second section addresses identification, evaluation and selection, discussing polices, guidelines and best practices, and rationales for digitization. The third section focuses on institutional impacts and discusses treatment and disposition of source materials, scalability, intellectual control and data management, coordinated collection development, funding, preservation, and support of users. A final section addresses challenges in evaluating costs and benefits, and offers recommendations. (Contains 47 references.) (AEF)