Here's the problem with publishers' and other content providers' initiatives to make more content available on mobile devices: People don't want more fragmentation between their computers and their mobiles; they want less. That's why they want more available on their Blackberrys and iPhones; they want to be able to access the same content from either portal. And so publishers should spend less time trying to come up with all new, exclusive mobile content, and more time trying to make sure that all of their content is accessible just as easily from a hand-held device as from a large screen-with-keyboard.
That's why we love the iPhone and are kind of put off by the Kindle: The iPhone lets you access the web you know and love while riding the T; but you can't get a Kindle book on your computer or your Blackberry, as far as I know. It makes it harder, not easier, to integrate your life digitally.