This is an elderly article, dating from Nov 12. I'm trying to track down something R. told me, and failing, but stumbling across all kinds of other interesting things.
"Ebooks now account for a 15% share of the book market and are anticipated to rise to 25% or higher by 2012."
I wish that were sourced; now I'm going to have to find out what that means and if it is true. (_Which_ book market?) The last time I was seeing estimates of e-book share of book market, it was closer to 6%, and a whole bunch of the punditry Was Unimpressed. And this was less than a year ago.