Oh my, I was preparing to post a short bit here, but I must admit to being taken off guard by your guarantee cagedcactus! Them there is fightin' words

(all in good fun though) I can’t say that I’ve heard that idea before and am curious as to why you would conclude this. We’ll have to agree to disagree on this one since I don’t consider the movies to be canon at all-sure they can be used as supporting evidence, but only supporting. If we are to conclude – that it’s not in the movie, it’s not important then we would be concluding that-
Voldemort’s quest for immortality is not important to the septology (which would eliminate the need for HBP)
Snape working undercover as a deatheater would not be important to the septology (same as above)
BCjr. Faking his death is not important
Lupin, James, Peter, and
Sirius were the marauders and James is an animagus Stag is not important
Etc..
JKR doesn’t say too much about the movies-she does have some input, but I feel that she looks at them in an entirely different light than the books-
JKR- I don't think people need help understanding the books. I hope the film will be really good and not disappoint the fans.
JKR-"That's not my bag. They do ask my opinion, and I give them my opinion. My input is largely creative, it's really with the screenwriter and the director. I've seen sets, and they're amazing. It's a very spooky experience to walk into the Great Hall, really very spooky.
JKR-"my opinion has been asked about all sorts of things where I really didn't think I'd ever be consulted. I'm grateful for that, obviously. But I'm also very aware that that's not anything to do with me, it's really to do with the readers.
JKRowling is a literary tour-de-force and the clues to guessing what’s to come is hidden in the words themselves-
JKR-"There is a lot in this book. If I can only say that I’ve had to lay certain clues in book five. Some clues are resolved, some things are resolved in book five and there’s information in there that you really do need to know otherwise people will feel cheated when certain outcomes happen.” Katie Couric 2003
JK Rowling:' No… I didn’t, I will say this. I had to put in some things because of what’s coming in books 6 and 7 and I didn’t want anyone to say to me “what a cheat you never gave us clues”. If I didn’t mention things in Order of the Phoenix I think you’ve said “well, you sprang that on us”! Whereas I want you to be able to guess if you’ve got your wits about you.
JKR uses Rowlinguistics (a word she coined)-words that are puns, words from mythology, latin, other languages, Olde English. She also uses homophones, homonyms, metonyms, portmanteau, and malapropisms. She is a linguistics genius! When Neville called the Philosopher’s Stone-the Phililogical Stone, she was giving a very big clue.
Examples-Knockturn Alley-nocturnally
Diagon Alley-diagonally
Occlumency-a clue men see
Gringotts-gringot(miser) + ingot(nugget)
When you are hiding your major clues in the words-you have to pretty much give up on that being carried onto film, it is impossible to do visually. There are 2 kinds of clues also, storyline and septology. If you go back through each book you will find words all over the place that give clues to what will happen at the end of the book-a really quick example w/o some of the linguistics is CoS, check how many times JKR uses the words-eyes, mirrors, glasses,freezing, snakes/slither, bathrooms, water,-her repetitive use throughout the entire book, were giving clues to the storyline resolution.(The fact that these continued to be running throughout the rest of the books gives us a clue that 1)we’ll see the CoS again and/or 2)there is another basilisk/slytherin yet to come) After you eliminate the storyline clues-you have all the septology clues left and there are so many it gives one nightmares. I already figured that a Slug-horned slug would feature prominently since this has been reinforced over and over. Something that frustrates me to no end is –before 5 came out I was guessing that
Harry had 2 souls, his and
Voldemort’s-and that
Voldemort was just souless (close-but no cigar), well the clues were there and there must have been clues about horcruxes (Hour + cross, lots to see now-oh and Moody’s 7 layer trunk) because I came across the myth about Koshchei the Deathless who divides and hides his soul-
“My death,” said he, “is far from here and hard to find, on the wide ocean. In that sea is an island, and on the island there grows a green oak, and beneath the oak is an iron chest, and in the chest is a small basket, and in the basket is a hare, and in the hare is a duck, and in the duck is an egg; and he who finds the egg and breaks it, kills me at the same time.”
Now I completely disregarded the idea of
Voldemort doing such a thing-mostly because I found it distasteful and didn’t think Jo would go there….boy was I wrong! Well needless to say-never say never. Although most of my guesses will be plain wrong-it’s still a lot of fun to guess, and I completely understand that not everyone wants to delve so deeply into the puzzle. The story is exceptional on it’s own!
Okay. I guess I went on a rant a bit! Well I’m probably in the doghouse now and I apologize if I offended

-it just that we now have very little time left to work this out and I’m feeling a bit emotional.
Jinemem-the theory you mention is still a valid one, we know that acromantulas were wizard-bred(the purpose is mysterious, yet probably linked to the basilisk) and HBP had the whole scene with Slughorn taking Aragog’s poison. The stick in the mud on that one though-was the fact that the Basilisk’s poison did affect
Harry, so it threw a damper on him being immune to poison. But then perhaps he is immune to acromantula poison while
Voldemort is not..so it is a great possibility. We’re just working on some other ideas and possibilities-which brings me to what I was going to post in the first place-
I’m running across evidence that shows Dragon’s blood (be it mythos or plant form) is necessary to the creation of the Philosopher’s Stone, so there could be something there. And Dragon’s blood, Unicorns, and Phoenixes are all symbols of Christ. Could ensuring that
Voldemort has all three components be part of the plan for his destruction?