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The Open Video Digital Library (OVDL) provides digital video files to the education and research community and is distinguished by an innovative user interface that offers multiple kinds of visual surrogates to people searching for video content. The OVDL is used by several thousand people around the world each month and part of this success is due to its user interface. This article examines the interplay between research and practice in the development of this particular digital library with an eye toward lessons for all digital libraries. We argue that theoretical and research goals blur into practical goals and practical goals raise new research questions as research and development progress-this process is akin to walking along a Möbius strip in which a locally two-sided surface is actually part of a globally one-sided world. We consider the gulf between the theories that guide current digital library research and current practice in operational digital libraries, provide a developmental history of the OVDL and the research frameworks that drove its development, illustrate how user studies informed its implementation and revision, and conclude with reflections and recommendations on the interplay between research and practice.

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Once undertaken primarily by museum professionals, the activity of curatorship has been popularized via the Web. Social media tools, such as YouTube playlists and Pinterest Web bulletin boards, enable users to curate a diverse range of materials for personal use and for broader publication. But what makes one set of "curated" items more interesting than another? In this paper, we show how findings from an initial humanistic inquiry led to a lab-based user experiment, and how combined insights from these studies have illuminated new research streams in both humanistic and design research modes.

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