If you don't have a computer the e-reader works fine because most of them allow for purchasing using WiFi. There are many a website that allow you to email books from their website to your device while using your device. This works well for folks who have a browser on their e-reader, like the Kindle.
One of the nice things about e-readers is that they do not require a computer. With the Kindle, you can buy a 3G device that allows you to buy from Amazon without WiFi. The browser does not work over 3G for the KT (although it does for the K3).
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