From the Joint Information Systems Committee (UK). This is one of the largest studies known on eBooks.
What is it?
The national e-books observatory project will assess the impacts, observe behaviours and develop new models to stimulate the e-books market, and do all this in a managed environment.
More info and survey results available at: JISC http://www.jiscebooksproject.org/
check out the results of the deep log analysis study of student ebook usage