It has taken the online retailer Amazon less than two years to make its Kindle device more or less synonymous with the electronic book reader,

There are, of course, other companies that have built electronic book devices, among them Sony (SNE) and recently Fujitsu. But Amazon’s (AMZN) Kindle has come to personify the e-reader in much the same way Apple’s (AAPL) iPod brand of music player is often used generically to mean an MP3 player.

While Amazon has yet to disclose exactly how many of the devices it has sold—analysts have estimated the number at about half a million units—other previously undisclosed details about the latest version of the device, the Kindle 2, are coming to light.

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