God I love the music they use. I have to say, graphics, gameplay, story aside (which are still all amazing), the music is my favourite part of the Bioshock series. On the other hand, I didn't even understand the story beyond "survive this hell-hole and get out" until I read the insane amount of articles on its wiki site.
Also, the movie is confirmed to be in pre-production and a severely tentative release date of late 2010 is set.