I had to pay a couple of items the other day, both for US$10, at the same place with 3 minutes of each other, and I decided to use a different credit card for each.
ANZ Visa charged me $14.37 + $0.43 conversion fee = $14.70
St George Mastercard charged me $14.29 + $0.36 conversion fee = $14.65
I did the transactions on 28th April 2009 at 11:38am and 11:41am
Dates I was charged, per the card Statements (online data): 27th April : ANZ - Visa 30th April : St George - Mastercard
Visa are remarkably efficient.... I am glad I don't pay any interest on the credit cards. !!!
They charged me the day before I did the transaction !!!!