I've switched almost exclusively to digital books over the past few years. I read most books on a kindle. I say it that way because I have a Kindle Fire and a Kindle Touch. I recommend them both as excellent products.
I also read on my android phone and have read on a blackberry as well. I'm a big fan of the convenience of having a book with me all the time. More correctly, I'm a big fan of having MANY books with me at one time.
If you've not yet tried the amazon kindle as a way of reading books or have hesitated to try them don't. It's free and there's an app for it on your computer. If you've got a PC you can download a program to read e-books, like my upcoming new novel Jump/Drive when it comes out!