This is a season inspired by myth, but not just that of Santa Claus.
Here are some interesting pages on the truth behind Christmas. There is everything from the history of Christmas to if Poinsettias are poison, to if suicide rates really go up in the days before Christmas.
The About.com Urban Legends page about Christmas
Religious Tolerance's page about Christmas and Jesus's birth
The History Channel's page on Christmas History
Winter Myths Debunked