孙智谦 at Due East notes correctly how the US, though perceived by itself as being the leader in technology, actually lags behind for implementation:

You know those cool credit cards that are starting to pop up more and more, the kind that you can wave in front of the gas pump instead of actually having to go through the usual “insert card and remove quickly” routine? Those may be all the rage in America [...], but they’re old news. All the cool kids (who live in Korea) have USB credit cards now. They don’t have to enter information to make purchases online; all they have to do is plug their credit card into their USB port to pay for stuff online.

The sad part was that I actually first saw USBs come out nearly half a year in mainland China before the US even began to sell them! That and because I learned the Chinese for them (U盘) I called them USB drives before I learned the American catchphrase of thumb drive. And when it comes to any new and small tech product, you can expect a lag of at least 6 months from seeing it in Asia to seeing it in the US. Other areas such as an all-around card for any kind of public transportation and more (like the one in Hong Kong) is still not around as far as I know in the US.