I have to say that "A Death in the Family" is the furthest thing from a must-read. It's a steaming pile of drek, as far as the story goes. Not because the story killed Jason Todd - far from it. It's just a poorly written, not particularly logical story.
All that anyone needs to know is that Jason Todd was killed by the Joker at some point. The story where it takes place...blech.
I'm also not sure I'd call All-Star a must-read...but I suppose it gets referenced enough that anyone interested in Batman should see what all the hub-bub is about. Sadly.
I'm pleased to see a Gotham Central story made the list, though. It was a fantastic series and one of the best Bat-related books in a long, long time. Good to see it getting some of the respect it deserves - and the Joker story in particular.