Buy Nothing Christmas is a national initiative started by Canadian Mennonites who offer a prophetic "no" to the patterns of over-consumption of middle-class North Americans. They are inviting Christians (and others) all over Canada to join a movement to de-commercialize Christmas and re-design a Christian lifestyle that is richer in meaning, smaller in impact upon the earth, and greater in giving to people less-privileged.
Giving gifts at Christmas is a good thing to do - it's a small re-enactment of the incarnation of God's love. Gift-giving, as we know from other occasions (like birthdays, weddings, housewarmings) serves as a kind of social glue that keeps us together. It shows affection, thoughtfulness and love. While gift-giving is a good thing to do at Christmas, that doesn't mean we have to go overboard at Christmas.