I read through the book and poster earlier, but I'm also reading the book aloud to my kids, and am picking up on some things I skimmed through reading silently. I'm only going to hit some of the main things I've been thinking about and even then, Pop Daddy won't be able to handle it
:
1. Trelawney's first of her only two true prophecies was 16 years ago (before Harry's birth) which is reiterated by her "16 years of service" wailing when Umbridge sacks her. And Dumbledore will not let her leave. There is something more coming from Trelawney and Dumbledore knows it.
2. Then there is the years of service for Snape: 14. That would put his arrival at Hogwarts exactly at the time Voldermort tried to kill Harry as a baby (1 year old). What happenede exactly that turned Snape from Voldemort to Dumbledore? It's got to be big for Dumbledore to trust him so implicitly. This has been building since Book 1 and I expect it to be a huge revelation in the end, having something to do with Harry or Lily.
3. The crossed fates of Harry and Neville are haunting me. I haven't gotten to the very end with my kids to reread this section aloud again, but on first reading I was struck by the idea that these were the only two boys with whom the prophecy fit. We assume Harry was the "chosen one" because he was attacked and became the boy who lived. His parents, and it has been focused upon his mother in particular, dies to give him this protection. If Lily is connected to the Slytherin line, there may be something deeper there in Voldemort's inability to murder Harry, upon whom she conferred her power/love.
Now, how far afield is Neville's fate? What if Voldemort chose the wrong family to attack and sent Lestrange to the other's home? Neville's parents may well have been protecting HIM when they were attacked by Lestrange and thus he has survived through their sacrifice as well, although perhaps with far deeper scars than Harry, which I think is indicative of his personality thus far. I think his mother, too, still has a part to play in unraveling the mystery of the Neville/Harry connection. Total speculation here, but it would be fascinating if Neville plays as big a role in the final battle as Harry and turns out to be the one about whom the original prophecy was spoken and thus must kill Voldermort to save Harry.
4. I love the tone of the book and Umbridge is a perfect villain with whom to play an interlude before the great showdown with the Dark Lord. Rowling has said that she intended for her audiences to be of all ages, but that each sucessive book would be more adult as the characters themselves became more adult. However, I don't think most kids are particularly shut out of the fiction. My nearly 8 year old LOVES this book and is enthralled. She giggles at the stuff between Harry and Cho, and she looked very sad when we were getting through Snape's Worst Memory because she recognized the cruelty of James and Sirius. These are universal themes that, despite the angst, shine through.
5. If you haven't read the Stephen King review of the book in Entertainment Weekly, it's spot on. As an English teacher, I loved his explanantion of her overuse of adverbs which has been driving me crazy while reading aloud. He makes the point, though, with which I agree, that while her writing style has a few areas of work, her imagination is absolutely brilliant in this series, and continues to grow.
OK, I'll give it a rest for now.
Its weird, i feel the need to reread the book alot. Also, i picked up on TONS of refrences throughout the book about what i think could be intros or hints about the other books. i'll post them later if anyone wants. 
