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Amazon’s killing a feature that let you download and backup Kindle books
(www.theverge.com)
This is a most excellent place for technology news and articles.
Using calibre to just upload books directly.
I'll check out KoReader. Never heard of it.
Yeah, Calibre is the way to go. KoReader is basically custom built for Calibre, and includes things (missing from the base kindle firmware) like native metadata retrieval.