Coopetition, is a buzzword cropping up in many business publications these days. Basically, it means that competing firms look for ways to cooperate with each other, rather than compete head-to-head for business. Working in conjunction with the U.S. Postal Service, the United Parcel Service (UPS) now has a program that allows customers of participating retailers to return merchandise by dropping it in any U.S. Postal Service mailbox, or at any post office. The program features a special label that makes the service possible.