Instead, it's compatible with "Mobipocket" books, a digital format that offers more than 100, 000 titles, though many are noncopyrighted classics, romance novels and science fiction--hardly the material recommended by Oprah's book club.

FORBES: Magazine Article

Just a couple weeks after the Authors Guild's overzealous copyright-maximalist stance forced the bookseller to modify the Kindle 2's text to speech feature, the company's lawyers have had a fit of irony and sent out a DMCA takedown request to MobileRead, claiming that the site's links to a Python script that enables Kindle owners to shop at Mobipocket-format ebook sites constitutes circumvention of the Kindle's DRM.

ENGADGET: Amazon using DMCA to restrict Kindle content sources