3G is the phone network. If you have wireless highspeed at home and/or at work you probably don't really need it. The Kindle does have a beta (not standard/new) internet browser for surfing the net. If you do not have wirless highspeed at home it is worth it if you think you might like to surf on your Kindle from bed or the car or something. If you live in the sticks you may not even have 3G available. I'd check around and find out from others. Ask folks you know that live near you who have smart phones like blackberry or iPhone if you have 3G available. Their phones tell them what kind of network they are on.
In terms of the Kindle or Nook, it means that you can access the "store" feature to buy and download ebooks, even if you do not have access to a wi-fi network, as long as you are in an area that has 3g cell coverage.
As far as whether or not it's worth it...that depends. For me, it wasnt worth it because I have dozens and dozens of books already on my e-reader (I have a NookColor) that I haven't read yet, so it's rare that I would need 3g access to get a book. Plus, I almost always have wi-fi access because I do most of my book purchases from home (where have wi-fi). So it would be pretty rare for me to want or need to buy a book while on the go, and/or to be in a place that didnt have wi-fi.
Re: NTR-What's does free 3G mean?
In terms of the Kindle or Nook, it means that you can access the "store" feature to buy and download ebooks, even if you do not have access to a wi-fi network, as long as you are in an area that has 3g cell coverage.
As far as whether or not it's worth it...that depends. For me, it wasnt worth it because I have dozens and dozens of books already on my e-reader (I have a NookColor) that I haven't read yet, so it's rare that I would need 3g access to get a book. Plus, I almost always have wi-fi access because I do most of my book purchases from home (where have wi-fi). So it would be pretty rare for me to want or need to buy a book while on the go, and/or to be in a place that didnt have wi-fi.