Yep, I have seen the previews 100 times, they are on the Two Towers DVD. I read the book too, I am estatic about the movie- I am going to order my tickets in mid November like I did last year, and waiting at the theater 6 hours before they open the movie.
Not to mention, I am going to see in 10 times in the theater, like the first and second one.

Can you say obsessed........