QR codes are two-dimensional bar codes that are becoming popular here in the United States. They can contain text, web links, calendar events, vCard addresses, and much more. Some people even put them on their gravestones! You scan them with your smartphone to pull up the desired information.
The linked website allows you to create custom QR codes. Josh, a friend of Chad’s News, suggests making one that contains your vCard data and then setting that image as the lock screen for your smartphone. Should you lose your phone, your contact details are right there for anyone who finds it and wants to return it.