"But I thought of Draco as someone who is very capable of compartmentalizing his life and his emotions, and always has done. So he's shut down his pity, enabling him to bully effectively. He's shut down compassion — how else would you become a Death Eater?"
I know there was some argument--Harry never actually saw the Dark Mark and all that--but the fact that it was said casually in the context of other things pretty much confirms that Draco is, indeed, a Death Eater.
For the rest...
Learning more about Dumbledore in the next book? Interesting.
Sounds like we're right about Regulus--she seems pleased at the guess, and to have given the matter thought... especially since it was what she said she hoped she'd be asked.
Giggles and laughs at the oh-dear-maths on the number of people. Now she has another odd one with 3000 wizards/witches in all of Britain! With forty per year, as she says now seems to make sense, that's still about seventy in each of the four houses, so 280 students at Hogwarts... is nearly 1/10 of the wizarding population betwen the ages of 11 and 18 and attending Hogwarts? :p
She was surprised to find out that anyone had guessed R/T, and only found one reference. Oh, fellow crewmates on the Wotcher Wolvie... we weren't nearly loud enough! (Though at least it confirms that she didn't pluck it from fansites.)