I've been involved in retail book sales for more than a decade, and eBooks have been on the horizon now for nearly all of that time. I think they may have arrived.
I downloaded the free Kindle software for my phone just to see what it looked like. Then I downloaded a book that I was planning to read anyway, thinking I'd get started on the phone, and later grab the real copy from the coffeeshop to finish it. But I found the reading experience on the phone to be pretty nice, and before I knew it, I'd finished the whole book. And started on another. Four novels in, things look strangely different. It's easy to overlook just how much reading I do in a typical day. Checking news and gadget blogs isn't really a good use of time, but that's what I'd been in the habit of doing when I was waiting in line somewhere, or had 20 minutes of downtime. Since my phone's with me *all the time,* it's been trivially easy to spend that time reading a good book instead.
(Note: However you go about reading them, I highly recommend Christopher Fowler's Peculiar Crimes Unit mysteries.)