In many (south) Asian stories and may be in the Arabian Nights also there are tales of wizards, sorcerers and monsters (raksasas) keeping their souls in other well guarded objects which include diamonds and precious stones which have to be broken to destroy the soul. However these souls could also be stored in living creatures, usually a bird, toad, snake, etc. The animal had to be killed in order to destroy the owner of the soul.

I think that Harry himself could be a horcrux. He might have become one when Voldemort placed the scar on Harry's forehead. There is a clear connection between Harry and Voldemort through that scar. Also, we know that Voldemort passed more of himself to Harry through that scar than even he realized including some of his powers. The scar could be the link and is thus so vital to the story. I am not sure that even Voldemort knows this. He may find out in the last book 'Deathly Hallows' when he attempts to kill Harry. This could be a key to the riddle of the prophecy that links both Voldemort and Harry. Also I think that Voldemort being reborn using Harry's blood could also be very important to this thread of thought.

I know that J.K.R may have mentioned already that the two-way mirror that Sirius gave to Harry would resurface in the last book. I think this is very important because my assumption is that Harry will make contact will Sirius somehow. Sirius in a way really did not die in the traditional sense, he was removed bodily into another dimension (sort of).

If Harry really is a horcrux then he WILL have to die in order to destroy Voldemort. No doubt, Voldemort would probably be the one to kill Harry and thus bring about his own fall. If Harry finds out he is a horcrux, he MAY choose the path of death himself. But somehow I don't think that J.K.R. will leave us with an ending so bitter after giving us so much joy through her books. I think that Sirius may again play a vital role as will the two-way mirror. If all goes as I expect, more than one life could gain reprieve including one already thought to be lost.

Would love to know your take on this.