The Association of American University Presses has released Digital Book Publishing in the AAUP Community: Survey Report: Spring 2011.
Here's an excerpt from the press release:
Unsurprisingly, the 2011 results shows that every press is pursuing at least two digital publishing strategies, and almost all are expanding into many more. However, resource constraints continue to slow the development of healthy experimental models or delay the implementation of necessary digitization and workflow projects. Confirming the findings and recommendations of the recent AAUP report "Sustaining Scholarly Publishing," this digital pulse-taking indicates that finding new models to support scholarly publishing and strengthening the digital backbone of AAUP members are the top priorities in digital book publishing for the community.