I agree, that was very good.
The only little problem I have concerns the Empress of Racnoss, in that she didn't really do a heck of a lot. What I mean is, yes, she was a good villain and brilliantly played by Sarah Parish, she was awesome-looking, but I was kinda wanting her to actually attack the Doctor and Donna, rather than just staying where she was (perhaps that transmat took it out of her?)
Equally, the Racnoss 'star'-ship was a neat design.
And, if I was lip-reading correctly, the Doctor mouthing "Die" at the Empress was definitely one of those shiver-down-the-spine moments.
