ESTA Requirements Now in Effect
All nationals and citizens of Visa Waiver Program (VWP) countries, including Australia, are required to obtain a travel authorization prior to initiating travel to the United States. This requirement commenced January 12, 2009. Authorization may be obtained online through the Electronic System for Travel Authorization (ESTA), a US$14.00 Internet application administered by the Department of Homeland Security.
VWP travelers should be aware that unauthorized third-parties have established websites, which charge visitors for information and for submitting ESTA applications. These websites are not endorsed by, associated with, nor affiliated in any way with the U.S. government.
VWP visitors should apply now for the travel authorization.
Apply for an ESTA at the U.S Government's ESTA website