Gerry Bowler - The World Encyclopedia of Christmas

For those curious about all the whys and wherefores of Christmas Traditions this is an excellent little resource [Note: Paperback Only]

At last, a truly comprehensive look at Christmas and all of its customs with its long history around the world. "The World Encyclopedia of Christmas contains articles on the history of Christmas baking, drinking, and merrymaking, and Christmas dramas, music, literature, art, and films. It includes entries on the evolution of the Christmas tree and the Christmas card, gift-giving, and decoration of church and home. There are profiles of the many gift-bringers, from Santa Claus to Babouschka, and miraculous tales of the numerous saints associated with the season. And there are histories of seasonal celebrations and folk customs around the world, from the United States to Japan, from Egypt to Iceland. 

Who, for example, knew the links between the Punch and Judy show and Christmas? That the medieval Paradise tree hung with tempting apples was the forerunner of the Christmas tree? About the Peerie Guizers, who terrorized the Shetland Islands, going door-to-door for Christmas charity? Or what Freudians make of our interest in Christmas stockings and Santa's entrance through the chimney? There are detailed accounts of Wren Boys and Star Boys, mumming and wassailing, the Feast of Fools and the origins of eggnog. And of course stories of the Nativity and legends of the Magi.