Damn, I was seeing all the signs all over about the release this week of the book, and I was about to come on right now and post something about spoilers and stuff, and I see someone comes out and spoils the book for me, and then you make a thread, saving me all the work of starting my own.
What odd coincidences....
Here's a spoiler for you:
EVERYONE DIES!Even better spoiler:
HARRY POTTER IS KILLED BY VOLDEMORT, BUT THEN VOLDEMORT DIES WHEN DUMBLEDORE APPEARS ALIVE AND BLOWS HIM TO BITS.
Ok, so every one of these are bullshit. But that's what the spoilers online could be anyway, bullshit as well. I certainly hope so for the link above.
A part of me wants to go driving past every book store at midnight and yell out the ending to the book. Another part of me wants to stay alive, let alone keep my health. And I'm not that big of an asshole.
As everyone already knows, Snape Kills Dumbledore. It was absolutely hilarious when people went around all over the place spoiling the book (especially at 4chan, where moot posted a background sound of the audio version of the spoiler).
I've never read Half-Blood Prince. And now it's spoiled for me. I know that Snape kills Dumbledore. How tragic.

...Ok, so what happens in the rest of the book?
Wow, One page in the entire book is spoiled. I'm scarred for life.
....So what happens on the other 800+ or so pages?
How does it get to the point where Snape does what he does? What happened beforehand? What were Snape's motives? How did Harry, Snape, and Dumbledore get on the tower in the first place? Why didn't Snape kill Harry (no witnesses?).
I've had part of the book ruined, but not the whole book. I have no idea how things progressed from Harry leaving the Dursleys and going to school, and then it ending up in a melee at Hogwarts and then to that showdown.
For me, what's important is the content of the book, not the ending. Sure, it sucks to know the ending, but I only know part of the ending, I don't know the whole picture. And the only way to get that whole picture is to read the entire book.
So I don't let the Dumbledore spoiler bug me. I don't know if these spoilers are correct, I certainly hope not. But if they are, I'm still going to enjoy the book when I read it. Because I'd want to find out WHY it ends like it does, if I know the ending. The ending of any book is only part of the story, what causes that ending to happen is the whole story.
So, go enjoy your book, and watch out for spoilers, and if you accidently get one, don't let it ruin the book for you.