In a book titled Harry Potter, one would expect Harry to be central to the plot. According to the prophecy Voldemort has to die in order for Harry to live or vice versa. There is no doubt in that. The actions of Dumbledore, I believe, were not only to prepare Harry for the inevitablity of the prphecy playing out but also to direct him towards a truth unavoidable yet unthinkable.

There is a piece of Voldemort in Harry. Denying that would be like saying that the whole incident with his parents dying never happened.

There is a strange parallel with Ginny's relationship with Tom Riddle in Chamber of Secrets and Harry's relationship with Voldemort. Both Ginny and Tom were linked with each other through the Diary with Tom gradually becoming strong enough to possess her body because she opened herself too much to him. Harry had to destroy the diary in order to destroy Tom. We already know that the diary was a horcrux.

If we draw the parallel, the scar is what links Harry and Voldemort. Through which they can both communicate. Every time Harry has a vision of Voldemort his scar hurts. Only Harry knew about this connection at first, Voldemort didn't, the scar being on Harry's forehead and not the other way around. The scar seems to operate quite similarly to the diary (a horcrux) in CoS. The reason why I think Dumbledore knew that the scar was a horcrux was because he had Harry study Occlumency. If the scar acted like the diary it could have eventually allowed Voldemort to gain control of Harry much like Tom controlled Ginny. Dumbledore had Harry study Occlumency so that Harry could keep Voldemort out of his mind.

In the CoS it was Harry who destroyed the diary and not Ginny, the person who was possessed through the horcrux. If Harry's scar is a horcrux, I can't quite imagine someone stabbing it with a basilisk's fang without killing Harry. I think the events in book 7 might play out quite similarly to CoS with Ginny playing a major role, even that of a savior. Harry will emerge from this alive with his scar gone but he may have some form of a deathly experience in the 'Deathly Hallows' and under these circumstances Sirius will also play a major role and could possibly return from the dead.

Oh you're right he's not little any more. I'll call him big Harry from now on.
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I just dont think Harry could be a Horcrux.. that takes to much concentration and magic.. besides when Voldemort went to go kill Harry that night on Oct. 31st he did not mean to transfer some of his powers to Harry. it was a mistake becasue he over looked the power of love. I dont think the scar is a Horcrux. its just to much of "what if" type of thing.

I bolded part of your thing up there because i wanted to make a point. Voldemort did not know about the scar being a connection right.. so how would he of made it a Horcrux.. i just dont see any proof that Harry's scar is one..