The Kindle only allows the reading of Amazon DRM-protected content.
Plenty of free e-books in Mobipocket format show up fine on Kindle.
The Kindle has a built in cell receiver so that you can wirelessly browse, preview and purchase books using one-click.
Ebook readers have extremely high contrast/readability and are extremely energy-efficient, being able to display several thousand pages of material without needing to recharge. eBooks are a narrow product, but they have their own ways in which PMPs cannot compete.
A revolutionary portable reader that wirelessly downloads books, newspapers, magazines and blogs to a crisp, high-resolution electronic paper display that looks and reads like real paper, even in bright sunlight.