It's called "Låt den rätte komma in," which stands for "Let the right one in." It was an amazing film. (Or 'movie' if you like saying that better. I'm not trying to be all contrary here.) I saw it at Circle Cinema, but I'm not sure how long it's showing there. It was so good, though. Really.
The movie's about a Swedish boy who meets a girl and they fall in love. It's really about vampires and family and enemies too, but heck, the movie was so endearing, I can't help but just focus on the lovestory. It is so good, though. Really.
I'd highly recommend you track this one down and watch it asap. It's just so good. Really.