The Verizon card is broadband wireless. It isn't available in every city, but you can get a map from them showing where they have coverage. In areas that don't offer broadband, you can usually still get on at higher dialup speeds.
I tried it out in a hotel off of the beach in FLL and I was impressed but not impressed. Its not that fast but still better than any of the other phone companies until a better technology comes out. It only seemed to disconnect a few times a day which is not too bad.