For the second year in a row, Apple is running their 12 Days of Christmas promotion for UK residents. From December 26 to January 6 anyone with a UK iTunes account can download a free song, music video, app, television show, or film from 'some of the biggest star performers' on iTunes. Each free download is only available for 24 hours, so be sure to sign up for their email alerts to be notified of the new daily download.
As for our US readers: it's not exactly Bah, humbug! for you.
UPDATE: France, Germany, and Italy! Apple has love for you too!
UPDATEx3: Netherlands, welcome to the party!
UPDATEx4: And practically all of Europe and Scandinavia!