[X-Istence]

In many other countries you don't let your credit card/debit card out of your sight. When I was in Canada for PyCon the wait staff would come back the credit card machine, and I'd pay right there and then. My credit card never leaves my hands.

This is more secure against skimming too, and allows Chip & Pin to be easily used.

[i386]

In my experience here in Australia and recently traveling around Europe, the US is the only country that hasn't seemed to get mobile terminal/contactless. It's like they missed the last 5 years completely.