If you have a PS3 and want to try HuluPlus, go to huluplus.com/ps3offer for a 2 month trial. You will need to enter a credit card number. I just used my Visa Debit and it worked fine. For your postcode, use your existing NZ one and either put a 1 at the start of it or 0 at the end. To check if matches a valid US postcode, go to this website to check
https://tools.usps.com/go/ZipLookupAction!input.action?mode=2
Once you are sorted, HuluPlus will take you to a page to activate your device. If you haven't already, then set up a US account on your PS3 and download the HuluPlus app from the Store. You will probably have to do an update of around 30mb. Once installed, click Log In and an activation code will appear on screen, enter that on your computer and you are good to go.
Enjoy.