Starting with the 12 January 2009 will be more complicated to make the trip across the pond.

Norway is among the 27 countries covered by the new regulations in which all must get an approval to enter the country.

International travelers seeking to travel to the United States under the visa exemption applications, will now be subject to stricter safety requirements. All qualified travelers who want to travel under the visa exemption program must apply for travel permit

This may be applied for online, through ESTA (Electronic System for Travel Authorization, red. Note), the U.S. Embassy in Oslo in a press release.

You can download the application form ESTA here.

Has not acquired a valid ESTA evidence can be refused entry on the plane to the states or be denied to get through U.S. customs.

If you get off ESTA application, must have a valid visa to travel to the country.

Here you can find more information about the visa and what is required to visit