New US Travel Regulation for Non-Visa Travelers Announced

For Australians thinking about visiting the US make sure you read this travel advisory before heading off or you might find yourself stuck at the airport:

TRAVELLERS who do not need visas to enter the United States will have to register online with the US Government at least three days before they visit, under a security regulation set to begin next year.

Homeland Security Secretary Michael Chertoff will announce the rule today,, a US official said.

Required online registration will begin in January and will be valid for a two-year period. Australia is among 27 nations whose citizens do not need US visas. [Herald-Sun]

I would assume there is a good reason for this but the fact that Michael Chertoff came up with it gives me doubts.