I finally got to sit down and read the book while on vacation last week.
Some random thoughts..... forgive me if I get some details wrong, I don't have the book in front of me.
I don't think Harry or his scar is a Horcrux. I seem to recall that the point was made that it's risky to use a living being as a Horcrux because it gave the soul fragment a way to take action on its own - which is why Harry and DD were uncertain about Nagini being a Horcrux. Plus, the Horcruxes have to be destroyed before V can be killed, and if Harry is destroyed, it's kinda hard for him to kill V.
V wanted to use baby Harry's death to create one of his Horcruxes, but Harry did not obligingly die. I suspect that V had his soul fragment all prepared for "Horcruxification" at that time - and somehow, that allowed something of V (like the ability to speak Parseltongue) to be imprinted on the victim, Harry - but it's not part of V's soul.
On to lighter topics... I liked the aspect of various characters getting together, especially the part with Ron and Lavender sucking each other's faces off while Hermione gets pissed. When I got to that part of the book, all I could say was "Oh, my" every couple of paragraphs... I knew when my husband had gotten to that part of the book because all HE could say was "Oh, my!"

It gives a nice added dimension... they're witches and wizards in training, but they're still horny teenagers.
Back to some heavier stuff... About Hogwarts. I think (I hope) it will stay open under Prof. McGonagall's leadership. My guess is that a lot of parents will pull their children out (we've seen some of this already), but there will still be some students there, including Ron, Ginny, and Hermione. I hope Harry returns... Hogwarts is really his only viable option for a home base.
Another random thought... Harry has V. GreekChat has the V's. Coincidence???