Included in the player above is the specially filmed scene for tonight's Children In Need. It was written by current showrunner Steven Moffat (who is 50 today, incidentally) and stars Matt Smith. Let's call it Naked Cutaway, shall we? It also includes the trailer for The Doctor, The Widow and the Wardrobe.
Ewan McGregor: "no interest" in Doctor Who
2011 Christmas Special promo pic
Children in Need 2011 promo pics
Series 6 Boxset preview
The Long Game audio commentary