I saw it yesterday afternoon.

It's pretty faithful to the book Fellowship of the Ring, only a few things here and there. I haven't read Twin Towers yet, so I'm not sure how much they borrowed from that and put into Fellowship, because there are a few things in the movie I don't remember from the first book, but I've heard of them before.
I still can't get over Agent Smith as Elrond though.

I just was waiting for him to say "Do you hear that, Mr Baggins? That is the sound of inevitibility."