There are converters available from Amazon and/or Mobi for pdf and doc files.
The Kindle only allows the reading of Amazon DRM-protected content.
The Kindle has a built in cell receiver so that you can wirelessly browse, preview and purchase books using one-click.
Use Mobipocket software to convert PDFs to that format so you can read them on Kindle.
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.