We ran across a couple of free e-books which you can load on nearly any device, including phones and PCs. Amazon is offering the Multistate Professional Responsibility Exam (MPRE) published by Kaplan as well as Constitutional Law: Core Concepts and Key Questions, also by Kaplan. They will also work on Kindles, iPads, and Blackberrys.
We don't endorse any specific products, but these might be helpful additions to your library of resources.
