As ebook collections grow in libraries of all kinds, new standards of evaluation are emerging to ensure that these collections are meeting patrons' needs. This presentation will explore through case studies several frameworks for evaluation including cost, collection diversity and standards, usage, preservation, and technical services workflow. Particular attention will be paid to the demand or patron driven programs that have been emerging in increasingly diverse libraries. Participants should expect to leave the session with practical and actionable ideas for evaluating their own digital collections.