I have to say, I watched the film the other night (and sequel) and the main music theme that really stood out is the one surrounding the investigation of the video's origin and Samara's past. I think the track for this particular chapter of the story is "Shelter Mountain", with its creepy yet fantastically done strings, and the clever key change between each bar making it really eerie and mysterious. Great pace and build up too!
I'm not so keen on the other tracks towards the end of the album, with the fx becoming more dominant in the music, as i don't feel it really suits this particular story or film, so the 4 stars is just because I feel its some of Hans Zimmer's best. The more electronic take on horror/the darker film genre sort of thing works brilliantlly in the Underworld Soundtracks, and the epic "Eternity and a Day" track from Underworld Evolution. Really beautiful.
I really recommend checking that out.