So, I actually use an iPad...

Okay, I admit, not for much, but... I do use it.
I have amassed a virtual library of language references from amazon, for the Kindle app, both on the iPad and the android acer a500 which I purchased for one helluva painful Java project -- but that is another story entirely that will have to wait for the release of said software ( should the project ever become unpaused).
I am still slightly bound to paper, though I have found that I am not doing a 1 to 1 purchase digital to paper. Also, amazon has a limited selection of the classics, so I have not matched my physical collection title-for-title.
It is a pretty expensive e-reader, but in defense of said usage, I did buy it for the aforementioned project. ;)