JISC has released a podcast: Open Access—Harvard's Success Story with Robert Darnton.
Here's the announcement:
In October 2008 Harvard University in the US adopted an open access policy for all its research papers to be made available in their university repository, in an opt out basis. 12 months on, since the policy was adopted, JISC's Rebecca O'Brien speaks with Professor Robert Darnton, Director of Harvard University Library and trustee of New York Public Library and the Oxford University Press (USA), about the cultural change that is taking place at Harvard and the background to why professors at the university decided to share their knowledge in this way.