This is one you're going to want to remember!
The Mobile Passport App allows you to fly through Customs (no pun intended), by electronically submitting your passport and trip information, and bypassing the regular Customs line.
Download the [free] app and set up your profile by answering a few questions. Then, once you are at your "port of entry, connect to Wifi, and submit your data. Follow the "Mobile Passport Control" signs, present your passport, scan the Customs barcode on your app, and you're on your way!
Mobile Passport Control is now available in 22 airports and 1 cruise port.