With Santa expecting to arrive tonight, here's a recap of something I posted last year at this time of the year.
The Physics of Santa discusses how the jolly old guy will complete his task tonight. There is also another article that discusses this, so you can compare them. On a newer front, this website on About.com has all the physics you want to know associated with Christmas. And here's another article on the physics of santa, including the aerodynamics question on how he could fly.
Plenty of stuff to read if you are bored with the holidays. :)
Happy Holidays everyone!