We started trading postcards late last year. We chose to begin with families within Canada, but have already received a few worldwide requests. We find Winnipeg postcards, add our own knowledge/insight, and send them off. The receiving families do the same from where they live, and we receive a card for our collection. We get to read a bit about where they are from, and we keep our cards in a map box, where we can mark the location of each we have received.