The first really comprehensive report on digital publications was produced by the Gilbane Group and called Growth, Trends and Best Practices. It studied both business to business publications and business to consumer publications, using data from several industry leaders. It showed tremendous growth in the category of digital reading (even before tablets) and included over 20 case studies of best practices. We’ve included here a screen shot of the main Best Practice findings and the link to the original publication is in our list below.
That report came out in 2008 and since then, there have been several more recent studies as the publishing industry adjusts to new devices and new ways of reading.