I guess this would be classified as anecdotal evidence with little statistical value, but here goes. I used to be a voracious reader up until a couple of years ago when I started working on my dissertation research and since then I have hardly had any time to read. Even on commutes, I didn't want to carry a lot of physical books. However, since I got my iLiad 4 days ago, I have:
(1) Finished a 350 page science fiction novella.
(2) Borrowed an eBook from the local library and finished it (100 pages).
(3) Gone halfway through another 500 page science-fiction book.
Of course, some of this could be attributed to the novelty factor of the device but I feel that I feel that it is much more convenient for me to read around the house given how light the device is and how easy it is to carry around. I am pretty confident that I will be reading a lot more with the iLiad than I was without it. Of course, it also helps that I can checkout books from the DC and New York libraries right on my computer