If you're looking for something to get you in the mood for Christmas, what better than a visit to your computer from Saint Nick?
Santa and the City 3D Christmas Screen Saver sees Father Christmas enter your PC whenever it is idle. Configure the screensaver and a 3D version of Santa on his sleigh will fly around the city through the snow. The graphics are excellent and the sleigh bells and sounds of the Santa laughing will really put you in the festive mood. Note though, that the screensaver is a bit of a memory hog.
Install the Santa and the City 3D Christmas Screen Saver and you'll be ho-ho-ho-ing all the way to Christmas day.