If I had a EAN.UCC Company Prefix of my very own (only $750 dollars!) then I could assign all my relationship partners a unique GSRN or Global Service Relationship Number (pdf). This would be very useful when I need to quickly retrieve the details of any given relationship. In some cases I might want to hand out multiple GSRN to the same person, since our relationship is framed in different modalities; friend/coworker, wife/mother/helpmate. I could then mark up all my correspondence so it might be quickly associated with other aspects of the relationship. Membership cards! Better yet jewelry with RFID chips embedded. Then when they drop by the house I could dynamically customize their visit to my home.
Bar codes? Not just for tangible items anymore! Label the intangible. This is going to be big!