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Summary form only given. We have analyzed a number of these services in a research library (personal collection management, annotation, institutional repositories, and learning object repositories) in terms of their user and task requirements for three prototypical users: a researcher, a teacher and a student. Given these, we develop a unified conceptual model of how these services should work together in collaborative situations and some of the requirements for systems and service organizations that might implement them. This model centers around a vision of the digital library as the hub of a personalized, integrated information management environment.