The smart card technology is great, glad to hear Calgary is headed in that direction.
Here in Japan, not only can you use the smart card but you can use your cell phone. It works on the same touch pad. Also works for stores and vending machines etc...
When I visited Korea a while back, my friend in Seoul got us a T - card. This was really great, not only could you use the smart card for the bus and train you could use it in taxis. The touch pad was just resting on the arm rest beside the driver. One important point to note is that taxi fares in Seoul are extremely cheap.
just my recent smart card experiences