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What are your favourites? *SPOILERS*
Mine would have to be:
Halloween, remake (I found the ending to be sad for some reason, especially whenever they showed them as kids).
P2 (I thought it was a beautiful ending, scenery wise).
30 Days Of Night (see P2).
The Hitcher, remake (seeing Sophia Bush blow John Ryder's head off with a shotgun and a song by Gomez to end it, what a kick ass ending).
Saw (I was SHOCKED).
1408 (As much as I disliked the film, the ending was sweet and had me going WTF? was it real or not?).
The Reaping (OMGZ, she's pregnant with an evil child!).
Final Destination 2 (Pretty sweet ending).
I'm sure there's TONS more, esp. older films, but I can't think at the moment. But most of the endings to the horror films in 2007 were satisfying for me.