As I mentioned here last year, you can track Santa's progress on Christmas Eve with your kids online at the NORAD Track Santa web site.

On December 24th kids can call toll free at 1-877-Hi-NORAD anytime after 9AM Eastern Standard Time (7AM Mountain Standard Time) to find out the status of Santa from NORAD. Or, even better, check out the NORAD Track Santa web site (available in several languages):

Looks like Brent's got a good list of online resources, too. Enjoy.