I'd keep the myth alive until they stop believing on their own. If necessary I'd strap a few pillows to my torso, put on a giant red suit and beard, and pay them a visit.
As Thanatos said, you have so much fun at Christmas waiting for Santa, why spoil it for the little 'uns?
obviously, if u tell them about santa, u have o tell them about the easter bunny and tooth fairy. I will tell my kids and make them as happy as i am around christmas. Out of habit, my parents still sign some of my gifts from santa. And like lenny said, id go and get a suit and jump through my chimmney if it meant keeping it alive.
So true. The whole country is getting into it man. All the celebritys are doing the athiest thing and liek they had to ban athiesism manuals from all the middle schools. Its freaking huge, and it just popped up recently, and it will soon dissapear. Ya athiesm is a fad... like YoYos!