NORAD (the North American Aerospace Defense Command) has been tracking Santa since way back in the fifties, when a child in Colorado dialed a wrong number for a Santa call-in line, got the Continental Air Defense Command --NORAD's precursor-- on the line instead, and asked about Santa's flight.
Things took off from there... and now the Norad Tracks Santa web site gets millions of hits on Christmas Eve. Every year the display at the site gets better and better.
If you're on vacation, track Santa as he passes both your home and your vacation destination. Kids sometimes get worried that Santa won't find them!