Right now I think my favorite is still The Master by P T Anderson.

If you've seen Walk the Line (biography of Johnny Cash) Juaquin Phoenix plays almost the same character, with some strange parallels, and I couldn't help but notice some parallels also between the life of Johnny Cash and Phoenix (both lost their older brother when they were young, who was considered to be the better of the 2 sons).

Zoth, I'm also a huge fan of Let the Right One In (as well as the American remake, not as good overall, but Chloe Grace Moretz is an amazing actor). It's very interesting and informative of the characters and the story if you pay attention throughout both movies to the windows and the various ways shots are framed, especially if the camera is looking through glass or something similar. Notice both main characters live in apartments with something obscuring the view and the sunlight from the outside world, representing their desire to hide from people. When we first see the room where the girl lives the window is being covered from inside with cardboard, and there's a decorative swirly glass panel with very thick opaque glass standing in front of the door in the little boy's apartment, so people in the hall can't see clearly inside. In fact the foil over the girl's window plays a very powerful role in one scene of the movie.