Loved the Fires of Pompeii - Donna was fantastic, bringing the Doctor back from the brink of Time War PTSD and making him realise that while he couldn't save Pompeii, he COULD save that family. I'm really digging Donna and her no-nonsense attitude. And the water pistol!!
Hee!
The part that has all the 'chippers squeeing is the line where the lead sybil (old stony-face) said "she is returning!" I have to admit, I shivered a little bit at that.
And what's with all the lost planets? The Adipose breeding planet was "lost", the planet of the magma-people was "lost", Rose is "still lost".... I'm beginning to suspect an E-space/Logopolis sort of plot.