NORAD(North American Aerospace Defense Command) is joint air defense system for Canada and the United States. They are doing more than Air defense. They are tracking santa since 1955. Instead of reaching santa by phone number, They have Created website using google technologies for tracking sant.

Every year Tracking santa is very hot activities in holidays. Untill today they are doing it by answering e-mail and phone. They are using powerful radar and satellite technologies for that. There are also Santa Cam network that began in 1998, which is the year they put Santa Tracking program on the internet. Santa Cams are ultra-cool, high-tech, high-speed digital cameras that are pre-positioned at many locations around the world. And They are used just once in the year at Christmas.
The NORAD Tracks Santa 2008 http://www.noradsanta.org/ site is up and you can play Christmas games until it shows tracking.

Mobile santa track is also available with google map for mobile.