[Drolefille]

6 total is what Dumbledore guessed.
We know the diary was one, and the locket is another.
One guess as to what they are
SPOILER BELOW:

Marvolo’s ring - Destroyed
Riddle's diary - Destroyed
Slytherin’s locket
Hufflepuff’s cup
Gryffindor artifact
Ravenclaw artifact
The bottom two are really the ones that are uncertain.

Oh also I'd say Harry is not a horcrux because Voldemort's been spending so much time trying to kill him. Why try to destroy the one thing that would help keep you alive? Also it was Harry that caused Voldemort to lose his powers (again while Voldemort was trying to kill him). I'm not sure there's any reason for Voldemort to target Harry so unceasingly if he's a horcrux. V. thinks that Harry will destroy him (and has since Harry's infancy) why try to make him into a horcrux?