I knew visa had their paywave, which IIRC is being used in all the coca-cola vending machines at the Olympics. I have noticed visa's logo on some PayPass machin

I knew visa had their paywave, which IIRC is being used in all the coca-cola vending machines at the Olympics. I have noticed visa's logo on some PayPass machines, however I believe, here at least, MasterCard offered incentives on the machines marked with MasterCard logo's only. I know PayPass hit the market earlier than Visa, so I believe visa is still playing catch-up. I have read Visa's started trailing its paywave in cell phones, however its first trial was 2 years behind MC's, so I believe it's still 2 years behind MC in its usage of paywave. If paywave hits the market big in say 2012, it'll likely be 2014 until people are using it with visa's.