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Amazon: Older Kindles can no longer download e-books
(www.heise.de)
This is a most excellent place for technology news and articles.
More than a decade on, and it's still one of the best kindles ever made, in my opinion.
You had physical buttons instead of a fiddly touch-screen, you could have music, have it read to you, and also go on the internet.
Plus it's old enough it supports a bunch of formats, and registers as a mass storage device to a computer, so anything can use it.
I mean it is very slow, and there are much newer readers supporting open formats. Pocketbook. Even Kobo is alright.
But "Best Kindle", is any jailbroken one I guess