I'll be bringing all three of my daughters to the movie, probably the day it's released.
My ten year old has read all the books repeatedly and lives for them. She thinks the movies are okay, but given the choice between reading one of the book and watching the movie, she'd choose the book.
My seven year old has the first three movies memorized and is 3/4 of the way through reading Book 4. She has to finish it before she sees the movie. This is her first extremely large book and she just started it a month ago. This book has opened doors for her....she wants to move on to the Lord of the Rings books! If a series of books can inspire SO many kids to dig in and READ a huge volume, then that has to be a good thing.
My four year old has been read the first two books and Chamber of Secrets is her all-time favorite movie. She freaking LOVES it.
I can't wait for the movie. It's a HUGE deal in our household. What's really cool for me is that my husband has been converted. He didn't read ANY of the book until the third movie came out on DVD. He read them all, and then watched all three movies....the guy NEVER reads. I'm so glad he did it, since the rest of us love HP so much. It meant a lot.