I don't think the scar or Harry is a horcrux. You have to kill someone to make a horcrux, right? Voldemort tried to kill Harry, thus Harry is not a horcrux.
As for Snape. I don't know if they were communicating then and there, or weather it had been planned. I remember Hagrid and Dumbledore arguing about something (?) possibly about allowing Snape to kill Dumbledore. It might have been both. Dumbledore planned it, but didn't tell Snape, so he had to tell him then. Either way, I think Snape is good.
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