Use Mobipocket software to convert PDFs to that format so you can read them on Kindle.
The Kindle supports Mobipocket files directly. You don't need to write a script to do that.
The Kindle is already able to read more than just Amazon DRMed content, it can handle a number of formats.
Being at home on a rainy day, but wanting to read some new novel that just came out, you can have it in seconds. This concept (not hobbled by DRM) is pretty damned liberating.
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.