Verizon is said to be giving Chromebook users 100 megabites of free connection per month. Granted, you can't do much with it, but I guess it would be an incentive to want to switch to Verizon, if you're not already with them.
I heard there is now NO-ONE offering unlimited internet. Even those who first bought it, like my neighbor, has been told he is limited to 5 gb and anything over that will be so slow you will not want to use it. Surely there is someone offering unlimited 3G or4G etc. for some kind of price, right?
I think the 3G would be a waste of money, especially with all of the places that offer WiFi now. And even if you can't get WiFi, there is the option to tether your phone (in my case Droid X) to the computer and go from there.
Verizon thinks they're being nice to offer "free" access, but in reality they're just trying to rope you into the more expensive plan.