We don't proxy or reroute the main amazon.com domain. The site should accessible worldwide, you can even shop for US items or buy US services with the only requirement being that you need to have a US billing address and US credit card.
Thanks for the update. I am just a bit paranoid when purchasing on Amazon with my US account - I always use a proxy, so wondered if still needed one. I do this after reports of people having their Kindles blocked because of too much use while overseas.