I have mixed feelings about Santa.
Sure, he represents the spirit of giving, is based on a saint and can be very useful for coercing good behavior out of children for about three weeks out of the year.
On the other hand, he has come to symbolize the overemphasis on presents, the blurring of the line between "wants" and "needs" and general excessive materialism during what should be a spiritual season. Nothing says "Gimme" like a kid making a list for Santa.
While most parents love to encourage the magic of Santa, making the annual photo on a store Santa's lap an important tradition, others shy away from embellishing the story too much. For it is a story, after all, and one children eventually learn is based on much "fibbing" by their parents.
But if you really want to get controversial, try bring up the topic of Santa in church.
As part of Christmas Eve family Masses, some parishes have added a visit from Old St. Nick, perhaps in part to pique the interest of kids who can't help but be thinking of what will be under their tree the next day.