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If you usually enter the United States with just a passport, this change is important to you. Starting in 2009, you'll be required to fill out this online form at least three days before getting on a plane to the United States. Once you fill out the form, it's good for two years and for multiple trips, so why not fill it out right now? You can read more about this change here and here.

Please help us spread the word about this to everyone who's coming from abroad. We don't want anyone being stopped from coming because of this change. Thanks chx for the heads up on this.

Not sure if this affects you? See if your country is part of the visa waiver program.

UPDATE: We've heard that Canadians, and possibly Mexicans, are exempt from this rule. But please double check with your consulate to make sure before you travel!