JK Rowling responds ...
The author herself updated her Web site with some words of wisdom for those who might be tempted to look at the spoilers.
My guess is, if she's taken the time to write something on her site, the spoilers must be authentic despite what she says.
We are almost there! As launch night looms, let's all, please, ignore the misinformation popping up on the web and in the press on the plot of Harry Potter and the Deathly Hallows. I'd like to ask everyone who calls themselves a Potter fan to help preserve the secrecy of the plot for all those who are looking forward to reading the book at the same time on publication day. In a very short time you will know EVERYTHING!