Both of my DDs have seen all the movies to date, but haven't finished the books. I wish they had been a little older when HP first came out. I read the first three books to them when they were three and five. When she was seven, DD#1 read the books on her own, but stopped about midway through the fifth book. Also at age seven, DD#2 listened to the books on CD, but stopped at about the same place in the fifth book. I'm not sure if the series got too dark for them at that point, or if they got bogged down with the length of the fifth book.
DH and I are going to see the movie, and then we'll decide if the girls can see it in the theatre or if they need to wait for the DVD. I can't wait! We're not going to the midnight showing (too hard to get a sitter), but we're going first thing Friday morning.
