Fred's death affected me more deeply than any fictional character's death has affected me before. I actually glaze over every once in a while and tear up when I remember that he's gone, that he died laughing and that George has to go it alone. Weird, I know ... I ultimately realized that his death makes me want to carpe diem the heck out of life, but I still miss him.
For some reason, it hasn't kicked in for me that Snape is dead. I read the death scene. I teared up during his memories. Still, as I read people's thoughts about the book and watch music videos about Snape and Lily, I keep forgetting that he actually
died.
I think Snape's storyline was, and is, my favourite of the series. And the most complex. Books 1 to 6, I was convinced that James and Lily were the ultimate tragic couple, and I loved them together, and felt awful for how they were torn apart and torn from Harry. All I saw was the love between them, the love that grew near the end of their Hogwarts years.
Now, though ... I still feel that Lily made the right choice. I think Snape's soul was sick, to put it bluntly. I think it was twisted and events coiled it even more tightly. But James had his issues, too. His verbal abuse of Snape had to be incredibly damaging, just as much, if not more so, as Snape's Dark Art attacks on him and his friends.
I remind myself every once in a while,
Well, Sirius tried to lead Snape to his DEATH, and yet you love(d) him! And I still love James, I still feel that Lily made the right choice, but that doesn't stop me from seeing the varnish stripped away from the Lily/James relationship. Maybe that's what makes it so interesting, that the varnish vanished and you finally saw their relationship for something much closer to what it really was.
I enjoyed this book so much, right up there with 3, 5, and 6.

Also, anyone who wants to see a neat music video about Snape and Lily, check this out:
http://youtube.com/watch?v=UCUhkpzcBcY