I was disappointed that Neville didn't figure too much in this one, too. I liked how Harry befriended Luna, though, and it was sweet how Luna was helping Neville at the end of the book. Interesting pairings, huh? I didn't see the Tonks, Lupin thing at all! That's SO cool!
I'm still wondering about if Neville might be the one who ends up killing Voldemort; if Voldemort guessed wrong when he went after Harry.
Maybe Harry uses Neville's wand? Since he can't use his own with LV. Maybe the core of Neville's wand has a feather belonging to Fawkes?