The most recent issue (Jan. 2012) of Library Resources and Technical Services (better known as LRTS) has an article that may be of interest:
"Notes on Operations: Kindles and Kindle E-Books in an Academic Library - Cataloging and Workflow Challenges," by Richard E. Sapon-White.
It is available through ELM, in the Academic Search Premier database (among others).
Have you been cataloging e-readers and their books? Any tips to share?