In preparation for Christmas and the premiere of this year's remaining Doctor Who specials, the BBC's official Doctor Who website launched their online advent calendar for 2009 earlier this month. The advent calendar will feature many exclusive treats over the next ten days and door number fifteen on the calendar is now available to open due to the fact that today is the fifteenth of December. Behind today's door, there's a brand new Christmas video message from David Tennant, Russell T Davies and Julie Gardner. It can be viewed in full here and content from behind the calendar's previous fourteen doors can be found here. This year's sixteenth door on the calendar will be available to open sometime tomorrow afternoon and details regarding the next special advent treat will be posted here on this site soon. What do you think of this new Christmas message?