There is a new Global Entry Program that sounds interesting if you happen to be a frequent international traveler. This new program is similar to the Clear Program that was offered for domestic travelers, and could be a time-saver for busy international travelers.
Travelers go through a background check and interview, give fingerprints and a photo, and pay $100 a year. In exchange, they use a kiosk to return to the United States instead of having to wait in the long lines to clear customs. Go to the kiosk, swipe your passport and go to baggage. If you have items to declare you cannot use the kiosk and have to stop and talk with the customs officers.
Many major U.S. airports do offer this program and the complete list can be found here.