That is the most brilliant idea on this site, Psyduck, at least I think so. But i have another idea, if he is a horcrux, then in what part of him did Voldemorts sould go? Did it fuse with Harry's(oh the possibilities of that) It would explain why the dementors like him so much(i'm not sure "like" is the right word) It would also explain why the sorting hat thought to put him in slytherin. But if there souls did fuse, and i dont see how they couldn't have, then can they be seperated?

Even if none of this is right, it sure would make a great fanfic.