Harry is almost certainly a horcrux

[alcuin74]

No: HPFGUIDX 150466

Having just completed another re-reading of CoS, I'm convinced that 
Voldemort unwittingly made Harry a horcrux that fateful night in 
Godric's Hollow.  The conversation between Harry and Dumbledore at 
the end includes this exchange:

"You can speak Parseltongue, Harry," said Dumbledore calmly, "because 
Lord Voldemort - who is the last remaining ancestor of Salazar 
Slytherin - can speak Parseltongue.  Unless I'm much mistaken, he 
transferred some of his own powers to you the night he gave you that 
scar.  Not something he intended to do, I'm sure ..."
   "Voldemort put a bit of himself in *me*?" Harry said, 
thunderstruck.
   "It certainly seems so."

Notice that Harry's response (which Dumbledore nevertheless affirms) 
goes beyond Dumbledore's original claim.  Not only did Voldemort 
transfer some of his *powers* to Harry, he transferred some of 
*himself* (but not intentionally, as Dumbledore says).  As we learned 
in HBP, this is exactly the function of a horcrux, to contain part of 
a person's soul or self.

If this is correct, then I can only conclude that Harry will have to 
give up his life in order to finish off Voldemort.  I believe book 7 
will see the heroic death of Harry Potter.

Alcuin