Previously you have to buy gift cards to access PSN US account,
Now that's history, you can pay with PayPal
Quote from ign
It came to Europe a while ago, and now PayPal for PlayStation Network purchases has come to North America. If you sign in to your PlayStation account on SonyEntertainmentNetwork.com, you can use PayPal to add funds to your wallet.
Why bother?
RRP is 20% lower than AU PSN
This is great news!
Not only can you purchase US content, you can now import US games and get DLC that will actual work with it.