Well I've sold European cards on Ebay to people in USA/Canada and they worked so I don't see why not.
Poeple don't realise the old XBox live codes from the original Xbox are exactly the same as the new XBox360 cards, so stores sell the old starter pack off with the game and headset included for £2 and I resell on Ebay and get £30 for the included code 
Unfortunately you don't see many of them now.







