There are sooo many entries on here, I don't want to go through each one. Someone mentioned earlier that a Rowling interview stated that an observant reader would be able to see what was in the next book by the clues on he last page. Is there a source for this info.?
She said that all the clues for the last book are in the first 6. Here is the link for the interview. Petunia overhearing a conversation about the dementors seems to be important as well.
http://news.bbc.co.uk/cbbcnews/hi/newsid_4690000/newsid_4690800/4690885.stm
Rowling said eagle-eyed readers of the current novel would find clues about the next one in the final pages.
Rutabega brought up an interesting point earlier, and I've been thinking about it, but I don't know what to make of it. If VM has split his soul every time he has made a horcrux, well...what exactly are the implications? If the first horcrux received 50% of his then-intact soul, would destroying that particular horcrux weak his grasp on immortality? And, since he has now diminished his soul seven times AND already lost, what...two of his horcruxes (and shouldn't that be horcruces?!) well, where was I going with this? Diminshment! Won't he be relying on his Death Eaters almost completely now? He seems to have put himself in a perilous position.