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Amazon has access to the books in your archive that you purchased from Amazon. Amazon does not have access to everything on your Kindle. Books you sideload are not accessible by Amazon.
Any party who can hack Amazon will get your user info even if you do not have a Kindle since they might be able to access your Amazon account. The same hacker could hack Sony or B&N or Borders and get your information from their data base. Even if a hacker somehow could hack Amazon and get your info from your Kindle, the same person would be able to get info from the Nook or Sony 950 because they have 3G or WiFI connection.
The replaceable battery is going to be a personal thing. I have one on my K1 and have not needed to use it. I have a feeling that my DXG battery will outlast my use of the device. One of the reasons that the Kindle is smaller and lighter then the Nook is the lack of a replaceable battery and memory card holder.
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