Amazon's Jeff Bezos says "Our vision is to have every book ever printed, in any language, all avaliable in under 60 seconds."
I'm not betting against him..
To me, when the free iPhone Kindle app became avaliable giving access to Kindle books even if you don't own a Kindle is a game changer.
Now every who owns an iPhone has a bookstore in their pocket!
Figure out how to get on the new wave, the old one has almost passed.