Run, don't walk and read this book, if you haven't already. An absolutely amazing book that ends the story and ties up loose ends. Harry, Ron and Hermione leave Hogwarts their 7th year and go on a quest for the remaining horcruxes. Along the way there are the inevitable adventures and coming of age experiences.
I found some of the camping scenes to drag a little. I know they were "on the run" and trying to find the horcruxes, but there was too much wandering. I expect that the film will tighten all of that up. While the book is the darkest yet, Harry finally, truly, understands what it is he has to do. The ending at Hogwarts is awesome. Dumbledore's Army makes an appearance, and we finally learn the truth about Severus Snape.
As good battles evil at Hogwarts, there are several tragic deaths. But, one of the best scenes is Molly Weasley dueling Bellatrix Lestrange. Don't ever get in the way of a mother bear!
We also see an epic battle between Voldemort and Harry. As Harry explains to Voldemort about Snape and Dumbledore and the Wand of Destiny, we see that Harry truly has grown up.
Rowling's epilogue is fun. It adds the romantic twist that Potter faithfuls have hoped for.
A perfect ending to the series.