An interesting case study (though sadly short on detail) from Kaplan Publishing on the print-to-digital paradigm, from the user-experience (UX) perspective:

Portraits of an Industry in Flux: Digital Publishing and UX (UX Magazine, 1/3/2011) - http://uxmag.com/strategy/portraits-of-an-industry-in-flux

I suppose one lesson is that times of great change also provide the opportunity to refocus resources, revise goals, and identify new tools in creating an improved product type.