The Kindle has many flaws, but it does allow you to read a few different non-DRM formats.
The Kindle supports Mobipocket files directly. You don't need to write a script to do that.
Typically ebook readers are larger than PMP's with larger screens. If you're going to read for a few hours, then the screen of a typical PMP becomes pretty eye-straining (due to size, contrast, and brightness).
Non DRM Mobipocket format is already supported on the Kindle - just drag and drop.
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