An interesting article on the use of Kindle - the e-book reader from Amazon in. Inside Higher Education. see http://www.insidehighered.com/views/2009/06/15/crowell while it focuses on the economics it makes some claims for their ability to enhance pedagogy.
I noticed that in making the economic case the capital cost of the Kindle (the Sony equivalent is over £200), with savings of about 30% on the printed books one needs to spend £600 on books to save money, and there is no second hand market. What is more they cannot easily be shared between people (other than passing the reader around and thus ones whole library).
However, the point about access to journal articles etc being easy and convenient and therefore changing pedagogy is likely to have an impact on the way in which these are accessed.
However, I suspect that the e-bookreader and then laptop will converge with very high quality screens and lower weight as laptops loose any motorised parts (discs, CD/DVDs etc).
But that is another matter.