Ithaka has released What to Withdraw: Print Collections Management in the Wake of Digitization .
Here's an excerpt from the announcement:
Based on the expected continuing needs for print materials, this report considers the minimum time period for which access to the original will be required and assesses the number of print copies necessary to ensure that these goals are met. While complex, this methodology provides for a variety of risk profiles based on key characteristics, with preservation recommendations that similarly vary. For example, many materials that are adequately digitized and preserved in digital form, contain few images, and are held in certain quantities in system-wide print repositories may be safely withdrawn from local print holdings without impacting either preservation or access.
At the same time, the report warns that other print materials may not yet be ready for broad withdrawal without threatening both access and preservation goals. For these materials, a number of strategies are recommended to increase the flexibility available to libraries in the future.