Originally Posted By: tonyc
Unless I'm mistaken, Kindle supports .txt, .mobi, and .prc files, as well as MP3 and Audible audio formats, without conversion or any emailing to Amazon.

You are not mistaken.

I think Bruno is inferring too much from the lack of PDF support, whose stated cause is that the Kindle's resolution is simply too low to support 8½×11 PDFs.

But you can absolutely install other eBook formats, either via USB or by downloading directly from the builtin web browser, neither of which costs anything, and does not pass through Amazon's hands.
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Bitt Faulk