Wifi and 3g
Just my 2 cents, but I personally can't live without my 3 g. It means that I can order books anywhere. When someone mentions a book or I see something interesting, I go up to the store and download a sample - much better than trying to remember the right book later. When traveling I've found the 3g much more reliable than wifi no matter if I'm in Pennsylvania or India (its much harder to get connection in some parts of PA). It might save me money not to have the 3g, and I'm sure I order more because its more convenient, but it is worth the lack of hassle.
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