Rasilon!
I think that was the high point of it for me. My brain went "yes! finally! something other than an ood!"
Don't misunderstand. Yes, it was sad. I was horrified to watch the Doctor die. And it really was one of the best episodes Russel T. Davies has written.
I just wish he could have lain off the ood obsession that one time. Just that once.

I liked how it gave some more explanations with regard to the time war. The timelords having gone Dagenham, for example. It explains a lot. They always did seem rather dodgy. Even in the old days.
But Rasilon! Whooow. I did not see that coming. And I love how they just buried it.

I also wonder who the woman might be. I had her pegged for the white guardian or some such until she showed up at the end. That theory was obviously wrong. I am thinking she might be Romana, but then I don't see how that could happen.

And I loved the fact that the knocking was a misdirection.

I may have more comments when I get round to it, but those were the first main ones.