The Visa Waiver Program (VWP) enables nationals of 36 participating countries to travel to the United States for tourism or business (visitor [B] visa purposes only) for stays of 90 days or less without obtaining a visa. The program was established to eliminate unnecessary barriers to travel, stimulating the tourism industry, and permitting the Department of State to focus consular resources in other areas. VWP eligible travelers may apply for a visa, if they prefer to do so. Nationals of VWP countries must meet eligibility requirements to travel without a visa on VWP, and therefore, some travelers from VWP countries are not eligible to use the program. VWP travelers are required to have a valid authorization through the Electronic System for Travel Authorization (ESTA) prior to travel, are screened at the port of entry into the United States, and are enrolled in the Department of Homeland Security’s US-VISIT program.
If you are a national of a Country on the US visa waiver scheme you will from 8 September 2010 have to pay a fee of $14 under the Electronic System for Travel Authorization (ESTA). From January 2009 everyone entering the US under the visa waiver scheme needs to apply under ESTA. So far there has been no fee for applying under ESTA.
ESTA takes up to 72 hours (3 days) to process and is valid for up to two years. So you should make sure that you leave enough time for the processing of your application. If you are thinking of visiting the US in the next two years and are a national of a visa waiver Country you should consider applying now and so avoid the new fee.
Visa Lawyer Blog

