This makes me miss NY. One side-effect of moving to practically suburbia is acquiring the car shackles: I pretty much can't do anything without having to drive there. Some destinations are accessible by bike, but not many.
When I used to drive to/from work I always had an audiobook to listen to. Sure, you can't read, but there turns out to be plenty of time to listen.
I firmly believe that the ebook/kindle market thrives off the possibilty of replacing books in this enviornment.
I agree that ebooks will eventually take over a large share of the book market. Wondering though, why do you think ebooks are particularly suited to subways?
As the article implies, there are initiatives to install a wireless celluar network inside the subways of nyc. While the premise of this project is to allow people to make calls in case of a train emergency, the practical application will be to allow people to access the internet while riding trains. As ebooks are cheaper than real books, I imagine many people would be interested in saving the money if they happen to live in one of the most expensive cities in the US.