Visa information for participants from outside of the USA is posted on the visa information page. Please review this process carefully and start your process early.
A New U.S. Visitors Tax Begins in September 2010
Effective 8 September 2010, travelers entering the United States from visa-waiver countries via the newly established Electronic System for Travel Authorization program will be subject to a $14 USD fee once every two year.
U.S. Customs and Border Protection will begin collecting the fees, (payment by credit or debit card) with a portion funding a new U.S. federal tourism bureau established this year by the Travel Promotion Act. Go here for more details.