i do think this year's doctor who christmas special is an emotional triumph, and makes me think a lot of night watch, at once dependent on knowledge of the recent history of the 9th and 10th doctors, but also a tribute to the whole series -- i loved that they used footage of all the previous doctors in the infostamp scene, but especially all the embedded references to the tenth (given now that we know he is leaving.) and all the in-jokes for the fans. and that it takes up the theme of the tenth doctor's loneliness again and for the first time allows him to address it directly. i suppose there aren't people who haven't watched it yet? but the law of spoilers being what it is i won't write any more about it just now.