"Though the Kindle is at heart a reading machine made by a bookseller—and works most impressively when you are buying a book or reading it—it is also something more: a perpetually connected Internet device. A few twitches of the fingers and that zoned-in connection between your mind and an author's machinations can be interrupted—or enhanced—by an avalanche of data. Therein lies the disruptive nature of the Amazon Kindle. It's the first "always-on" book."
Hmmm... like iTunes and iPods, it will be interesting to watch where this development goes.