David Wiley, in a recent blog post, relates the results of research conducted around reuse with the Connexions repository. The findings indicate that only 15 modules were reused 5 or more times. From the blog post:
To me, this study begins to confirm the “dirty secret” of OER – that the reuse emperor has no (or only very scanty) clothes.

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Dr. Duncan’s Dissertation, Patterns of Learning Object Reuse in the Connexions Repository, is available here: http://www.archive.org/download/PatternsOfLearningObjectReuseInTheConnexionsRepository/dissertation_Duncan_S_M_20090501.doc