I just finished Let The Right One In...
I saw that recently too!
I'd definitely recommend it.
At first, I thought it was going to hide most of the violence, but after about the mid-point, there are some quite graphic scenes. The hospital scene about 3/4 of the way through was quite a shock, I wasn't sure what was going to happen.
Also, the man she's with at the beginning, I kind of got the impression that he'd grown up looking after her, and perhaps she hadn't aged? I wonder how the relationship with the boy will end...
On another note, I hear they are making a US version. God knows how that will work, I expect they'll pull their punches quite a bit, and generally miss the feel. I'm not against US versions of good films in general, but there have been a few turkeys in the past few years.