I think I know where the locket horcrux is:
There was a small chest in 12 Grimauld Place that nobody could get open. The locket had a note from ‘RB’ - Regulus Black - that damned house elf that hates Harry has it
I don’t think Harry is a Horcrux (I thought I heard that Rowling was aghast when someone mentioned the theory*); I think the spell failed to work, though Voldemort intended to use Harry’s death to make another Horcrux. Harry’s death would have made number 7. Thus, Voldemort only made 6. One was destroyed by Dumbledore (leaving 5), and the diary was broken (leaving 4), and Harry has a lead on 3 of them (leaving 1).
My guess for Book 7? Harry spends about half the book tracking down Voldemort and destroying the Horcruxes he knows about. The final confrontation occurs late in the book, at Hogwarts. Snape, as per Dumbledore’s instructions, watched over Malfoy and tracked down the last Horcruxe.
I don’t know why, if any reason, that it would be on Hogwarts’s grounds, but almost everything magically important in the UK has happened there for the last six years. 
*I have no idea why. As Apos pointed out, it’s so bleeding obvious in the books that I can’t imagine her not intending it. But for all Rowlking whimsical charm, she’s not terribly logical.
Kreacher
Anyway, about the whole Harry is horcrux theory, it seems Rowling has ratcheted up the deaths since GoF. In GoF she killed Cedric who was known by Harry, but not really a friend. In OotP, she killed Sirius, Harry’s newly found Godfather. In HBP, she killed Dumbledore, Harry’s mentor and best adult friend. I think the last version she’s gotta kill someone BIG to continue the pattern. Now it could be Ron or Hermione, but it could also easily be Harry, trying to kill the horcrux inside of him. Don’t know if it’s true, but just some more speculation.
In every interview I’ve read, Rowling is so sly and will try to throw people off track if she can. Her ‘aghastness’ may have been a way to do so. Or she just may have actually been aghast, I dunno ;).
What’s worse than a dead baby horcrux?
A lorryload of dead baby horcruxes.
with one live baby horcrux trying to eat his way out
I think we can be almost 100% certain that:
- there are, or were at one time, seven Horcruxes. This is reinforced so many times in the 6th book that I very much doubt that we’re going to get "nope, oops, there were only 6, not 7 as we kept saying)
- Voldemort only had made 6 Horcruxes when he went to the Potters. So he had to have made 7 at some point after he walked into the Potter’s house
Given this, making Nagini #7 just seems to be a false lead, and sort of a pathetic letdown rather than something dramatic: it even seems that way in the book. Dumbledore suspects it, but seems unsure and hesitant about it: it’s just what he could come up with at the time. His arguments for it are really weak: the snake is unusually smart and connected to Voldemort? So what? We have cats like that, familiars, and we know that Voldemort can possess creatures (and DId posses Nagini at one time). That really points towards a payoff of it being something else.
Also, before he was re-raised in the graveyard, I can’t really see him making another Horcrux. He’s just too weak. And thematically, I don’t see him making another AFTER he is raised either. Harry’s murder is precisely when Voldemort would have made Horcrux #7, and Harry is the only thing around from that time that exhibits any clues of being a Horcrux.
Again: anyone who is against the Harry/Horcrux idea has to overcome the fact that Harry and Voldemort DO seem to share some portion of a soul. This is pretty undeniable. They are extremely similar, and we are told that Voldemort himself inadvertenly made them this way.
We are also told, by Dumbledore, that Voldemort CANNOT necessarily tell where a Horcrux is and maybe not even all that well when one is destroyed. It’s not clear that he knows that Dumbledore knew his weakness. So there’s no reason to think that Voldemort knows that Harry is a Horcrux. He is just as surprised by the Priori Incatantum as Harry is… but Dumbledore is not entirely surprised. Two souls struggling against each other?
Could Quirrel have been a horcrux?
One theory I’ve read is that Harry is the descendent of Gryffindor, which were it the case, which would be a reasonably good way of both explaining the seventh Horcrux, and making him an artifact of the fourth head of house.
Um, ahem… There are (at least according to plan) six Horcruces, not seven. Voldemort wanted to split his soul into seven pieces, one of which would stay inside him. So there’s his body holding one soul-piece, and six Horcruces holding the other six parts.
I was going to point this out, but upon getting to the end of the thread, I see you’ve done it for me.
harry is not a horcrux. dumbledore said that it is ill advised to have something that can think and act on its own be a horcrux.
tom has some object with him to house the horcrux after the death of harry.
an a.v. curse had never backfired before. no one could know what the effects would be. tom could not create the horcrux when a.v. blasted him.
it would seem that harry got hit with a bit of back wash from the curse.
i think there will be an interesting parsel war with nagini at the end. i’m thinking something to do with her fangs will do in someone at the end. rather like the basiliks fang did in the diary.
The Horcrux speculation is fun, and puzzling, but I’m interested in the Regulus angle too.
No offense, but did you miss the entire thread? If Harry is a horcrux, then it was by Voldemort’s MISTAKE, not his intention. I.e., your counter-argument just doesn’t fly.
That Harry can think and act on his own IS ill-advised for Voldemort. That’s precisely why Harry is so important and so special to Voldemort’s downfall. And indeed, that statement actually even MORE sets up the idea that Harry is the final Horcrux.
Sorry about the numbers: yes I’d been treating Voldemort himself as a separate Horcrux.
I’d say no: first of all, as I said, I doubt Voldemort could have made a Horcrux in his weakened state. Second of all, there would have been some mention or clue about it. Instead, as far as we can tell, Quirrel was straight possessed.
The Regalus angle is just too hard to figure out at this point. We know almost nothing about the guy other than he was a DE who supposedly was killed for chickening out on Voldy and he apparently was a Horcrux hunter. We don’t know if he’s really dead (the rumored dead have a way of cropping up) though it certainly seems that way (not only does his note say he’ll be dead soon, but Sirius says he’s dead, albiet in a very different way than the note suggests, and the house passed to Harry on Sirius’ death). We do know that there is some as yet unknown special reason why Rowling killed off Sirius (she said it would be made clear, so there must be more to it than simply offing him to have someone to off), but I can’t imagine how that would fit into Regalus’s story.
The other thing is that the picture Sirius paints of Regalus: fainthearted, a follower, a guy in over his head, doesn’t quite square with the picture the note paints (if it really is from him). The guy in the note sounds defiant and brave.
Harry(or his scar) might be a Horcrux because:
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Voldemort didn’t intend it. Though he was making a Horcrux by killing Harry, the backfire of Avada Kadavra killed Voldemort and put the Horcrux in Harry. Killing yourself and making a Horcrux at the same time actually isn’t a bad way to disappear for a few years(if you have friends to ressurect you). What he actually was planning to use as his Horcrux is unknown.
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It explains why Harry has insight into Voldemort’s moods and actions.
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It explains why the Sorting Hat struggles with where to put Harry. He belongs both in Slytherin and Gryffindor.
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It explains the prophecy. Voldemort thought he was disproving the prophecy by killing Harry, but actually he fulfilled it.
Anyway, I’m looking forwad to the next book. Perhaps Regulus Black will show up with a “Horcrux Detector” and it will start blinking like mad around Harry.
JKR said in the 2004 World Book Day web chat that Regulus is well and truly dead, and I don’t think she would outright lie about this.
Re Kreacher having the locket – I think it’s far more likely to be among the objects that Mundungus “liberated” from 12 GP and sold to the barman at the Hog’s Head (who is presumably Dumbledore’s brother Aberforth). Why else would JKR have included that sequence in HBP?
I think Tom Riddle’s Award for Special Services may be a Horcrux. It’s obviously an object that would have meant something to him, and, as somebody on another site pointed out, Dumbledore didn’t escort Riddle off the grounds after refusing him the DADA job, so he would have had the opportunity to wander around the school afterward. (The only problem with this theory is that presumably somebody would have noticed if he’d actually killed somebody at Hogwarts, but maybe he “borrowed” the award and returned it later?)
I still think it’s important that the scar is the same shape as the crack in the broken Gaunt Ring. It’d suggest that Harry was at one point a Horcrux but isn’t now.
Here’s a thought: LV killed Lily and James not just because of Harry, but because James had an artifact or talisman from Gryffindor house–he was known for “ignoring” the rules (I have lost alot of respect for James re the Snape memories)–and he was a thief. So, LV wanted that souvenier from Gryffindor(and didn’t get it). That’s a reason for Harry to visit Godric Hollow (gee, that name sounds familiar!).
Of course, the whole thing backfired and Harry got powers that LV never intended to share. I don’t think LV meant for HP to be a horcrux-and I doubt that HP is one.
I am fully prepared for Ron to die in the last book (or Hermione)–but it will suck if Harry does.
I thought the reason Voldemort went to Godric Hollow was to kill Harry, having heard the prophecy that either Harry or Neville would be able to overcome him. Likewise, I think that he sent the Lestranges and BCJ to the Longbottoms, where they tortured them in order to find out where Neville was.