The Digital Preservation Coalition has released Preserving eBooks.
Here's an excerpt from the announcement:
Written by Portico's Amy Kirchhoff and Sheila Morrissey, and published in association with Charles Beagrie Ltd., this report discusses the current developments and issues with which public, national and higher education libraries, publishers, aggregators and preservation institutions must contend to ensure long-term access to eBook content.
Digital Scholarship | "A Quarter-Century as an Open Access Publisher"