There's also trade agreement problems in this, in that if it suits the US to enforce this you're sunk... it's not just data services, I've been charged VAT on online purchases for a while now, and more and more US sites take address info and swap you to Euro sites where the price increases. In one case a US company site swapped me to a German site where the price increased 50% or so (CD dupe software, since you asked), and I told them to place the sale where the sun doth not shine. (For Biologists ths is an astronomical reference that loosely equates to 'where the monkey keeps his nuts').
Dave