And don't forget the Norad 24 hour Santa tracking site, which follows Santa's journey round the world as it happens, with illustrations. www.noradsanta.org/
There is also an advent calendar with a game on each page, and a Sanra village with music and more games.
On Christmas Eve at 5.57 the ISS will pass over the UK. It will appear as a fast moving bright light and (weather permitting) be visible for about 3 minutes coming from the west and heading east.