Paperless Books - What Rock Have I Been Under?

Okay, I'm not sure how long "they've" been around and what the whole scoop is on "them" yet, but I've just read about "e-books"!! Did you know that you can purchase these electronic book readers, and elimate the clutter, paper usage, weight, etc, from your life?
Apparently, up to 200 books and periodicals can be downloaded to a reader, at any given time. And, better than that, it remembers what page you left off at reading, you can change the size of the text, look up the meaning of specific words. Holy Cow, it's AMAZING !
I guess you can preview chapters to books that you're interested in reading and when you do decide to make the purchase, it can be done almost instantly.
They also have found a technology that they call electronic ink, so the reader doesn't burn up a lot of power, but uses some when you turn a page.
How many trees is this going to save? Obviously, millons.
You gotta admit it, technology is WONDERFUL !