Heh, it's interesting to see Harry growing, already, in his powers and his appreciation of them. Keeping him ignorant of the wizarding world is going to result in some severe surprises when he chooses to display his wandless abilities (mind you, I suspect that, as soon as he finds out that wands are supposedly required to work magic, he's going to keep very, very quiet about the abilities he's found in himself while still practicing them in private every chance he gets).
I did love the way Harry handled Petunia, using strictly non-magical methods and some very carefully applied balckmail. His calm approach probably unnerved her more than a very emotional one would ever have done. Given his analytical nature, it's going to be real interesting to see how he deals with Dumbles and McGonagall. Despite how she might want him for her House, I suspect she's going to be disappointed with Harry going into Ravenclaw or Slytherin; though I could see him going for Gryffindor as protective camoflage. Things should get quite "interesting" once he gets to Hogwarts. I do think that, to fit with this Harry, Hermione will need to be a bit more skeptical of "received wisdom" and authority than she appears in canon; still, a gray!Hermione or Dark!Hermione could be a good match for him (OTOH, if there's a girl in his class in Slytherin who's smart enough to have fit in Ravenclaw, she'd be an ideal match). Then again, why couldn't have have both?