Here’s a recently published (late Jan. 2013) advisory about e-reader lending from the Institute of Museum and Library Services (IMLS).
The document looks at federal disability laws and the August 2012 settlement between the National Federation of the Blind and Sacramento Public Library Authority regarding ebook readers.
The document is also available Wisconsin Dept. of Public Instruction or Web Junction Missouri.
IMLS Advisory: E-Book Reader Lending Programs by LJ's infoDOCKET