There could be some problem with iTunes. Before the iPad was official launched in germany it was not possible to get access to the german iTunes Store with the german iTunes Store account. That was fixed with the release.
Until then i had to create a second US iTunes Store Account with a US adress and gift cards.
So it could be so that you'll have to get yourself a (fake) US name + adress and a *.com email account like googlemail for example.
You can then order gift cards for the iTunes store for example at ebay and use them to pay at the US store (credit cards are filtered if they are no US CC).
Its not that much of a problem and a acceptable work around but maybe it will be neccessary.