The PDF support of Kindle DX doesn't work well. But it really can read the PDF files without adjustment of font. I tried to convert PDF files to Kindle version, but it doesn't support this kind of conversion. It supports .txt, .doc, ..... So maybe it's better to convert PDF to .doc first. It will be difficult problem.
There are many free Kindle books. It seems to be some conpensation to me for this business deal.
If you want to transfer PDF to your Kindle, you can attach your file to mail to @kindle.com, then Amazon would send the PDF to your kindle via wireless 3G network with a charge fee. Or you can transfer the file via USB for free(put it in the folder "documents" of kindle.) The two ways are not different.
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