A similar movie 'Let me in'
Not usually one to do this, but I just wanted to point out a movie that I recently saw that's similar to BTT, it's called Let Me In (not to be confused with the 2008 swedish version), with Chloe Moretz Grace as Abby. Came out somewhat recently (2010), based on a book as well. LMI and BTT are similar in the fact that the main focus of the plot is a growing friendship between a young boy and girl. However, it's "horror/intense/I have no clue, scary maybe?", while BTT is "fantasy", but with that said, that movie was somewhat falsely advertised (same as BTT), as the horror in the movie is somewhat limited (it's gory though). But despite the completely different genre's, the movies have so many similarities when it comes to the two main characters, I was amazed. I almost felt like I was watching a "horror" version of BTT, just with a different setting and plot (and chars obv lol). I won't lie, the first 10-15 mins or so are somewhat boring though.
Not saying you ABSOLUTELY MUST! see it or anything, i'm just putting it out there, because that movie ranks just a notch below BTT for me. Or, maybe you've seen it already and thought it sucked (or liked the other one better); either way, I just wanted to share it in case anyone else was interested.