The Kindle has many flaws, but it does allow you to read a few different non-DRM formats.
Non-DRM Mobi books, like free e-books found online in Mobi format, or files you convert to Mobi files, are already supported on Kindle.
The hack allow ENCRYPTED Mobi files to be read on the Kindle. So you can buy a DRM-protected mobi book and read it on Kindle.
Granted the PDF converter seems to have some trouble with graphics PDF's, but for books the converter works very well.
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