From the Huff-Po.
In the emerging world of e-Books, Kindle-Amazon will increasingly occupy a position similar to the iPod while Google (a collector and purveyor of e-Books) together with its partner Sony (a manufacturer of e-Readers) will forever be positioned at the lower end of the e-Book market along with several other manufacturers. This too, resembles the structure of the digitized music industries.
The Sony reader is less imaginative than the Kindle. It's cheaper, uglier, less functional, less popular, and its ecosystem is not as fully developed. While it is true that other applications spread Googles' inventory onto mobile devices, notice the vagueness of the term 'mobile device' itself. The Stanza, eReader and 'iKindle' applications are all add-ons for existing machines that have small screens and are mainly valued for other functions: phoning, messaging or mobile Internet connectivity. While electronics manufacturers constantly dream of designing, building and selling an all-in-one personal electronic doodad to 6 billion people, still no Swiss Army Knife will never replace a good corkscrew, a good screwdriver or a good pair of scissors.
Or to look at this another way...
The Kindle, on the other hand, is what you keep at home or take with you on vacation to relax into. It is for the book-lover who might occasionally buy a first, a signed or a special edition. It is lingerie.