Scott Ziegler and Cara Key have published "More Than a Pretty Interface: The Louisiana Digital Library as a Data Hub" in Codex: the Journal of the Louisiana Chapter of the ACRL.
Here's an excerpt:
When explored in their entirety, the data held in the LDL is as valuable as the digital facsimiles. The LDL may be conceptualized as a data hub, a place to gather and share the metadata of the participating institutions. . . . Exposing the data held in digital libraries, in ways that extend beyond traditional digital library discovery and access, opens pathways for researchers to investigate complex questions. This paper contextualizes the field of open data in historical institutions, and explores uses for downloaded metadata from the LDL.
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