If I could figure a way to get browse my library by author, series, or genre from my kindle then get the book I want from my Calibre library in Dropbox while not at home I wouldn't care if my kindle was only a book display device and could only hold one at a time. Since I haven't found any way, much less a simple way to get my books from Calibre to Kindle without being close enough to use a usb cord I'd rather keep at least my favorites (all 2 or 3 thousand of them) in my kindle. Memory is so cheap and small in size so why not? If I had a choice between chucking memory or whispernet (any version) I'd toss the whispernet. I bet it costs more than a couple gigs of memory does and takes up more room in the device.
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