Ah... the old ones are the best. (At dying, as Dalek Sec might say.)

1. Song for Ten - It may not be the greatest song ever, but in the context of The Christmas Invasion it was outstanding.
2. The way the Daleks move back at the mention of the Doctor.
3. That zoom-in shot of K-9 as he's being attacked by the Krillitanes. The wooden school floor makes me nostalgic too!
4. The fact that we're 2 years in and we've only had ONE glimpse of the other TARDIS rooms. I'm salivating in anticipation!
5. The alternate Universe Rose. I wonder if the two ever met?