harry potter audio books

I am reading, correction .. listening to all the Harry Potter all over again. The audio books are great, reader is just amazing at making things interesting by giving sound effects. Although I did not very much like Harry and Hermionie's voices, but overall effect is good. Now that I have read the 6th book and its almost clear what 7th book is going to be about (not ruling out surprises though), I can events in all the books in a new light. The books are totally sequential, and it appears that J. K. Roling really thought about the whole story before starting to write. I can clearly see how there are hints about events in book 6 right in book 4!!