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1) As you can probably tell already, quite a few people travel and/or frequent places where they don't have wifi.
2) With some (if not most) 3g devices, you don't need some clunky intermediary program to manage your books. With the Kindle, I almost never plug it into my computer; if I want a book, I can either go to the website and it gets sent directly to the device, or order and download it directly from the device itself.
If you don't need it, don't sweat it. But I prefer it, it really amplifies the ease of use.
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