This just goes to show why they're making it into two films. There's just too many iconic and important moments that need to be there. All they need to cut is the times when they're just hiding out in the tent, travelling around, everything else is pretty essential.
I really want to see the King's Cross Harry/Dumbledore scene. Voldemort shown as a cowering child on the floor in that part, it would be interesting to see how they handled that in the film. Also, I want them to keep the bit where Harry later asks Voldemort to show a bit of remorse for what he's done. He still thinks there's a chance Voldemort could be saved, however slight, but Dumbledore says it right when the child is there, it's beyond anyone's help.
What I want them to ADD to the final film is a little more interaction between Harry, Ron and Hermione after the fight has ended. In the book they go up to Dumbledore's office to see his painting, which is cool enough, but they really need to have a proper moment with the trio where they, I don't know, hug and thank each other, or something... If I were writing it I would hark back to the first film and have Hermione mending Harry's glasses again, occulus reparo or whatever the spell is. Some kind of moment like that.