I haven't listened to it in a while, but it popped into my head the other day. So I dug it up and played it over and over again.
That's the third movement of Beethoven's Seventh Symphony, a fine work of art. You're probably more familiar with the second movement. Movie makers like it a lot.
Off the top of my head, I can remember the second movement of Beethoven's Seventh being used in Photographing Fairies and, of course, Immortal Beloved. And apparently it was also used in Knowing, but I've never seen that film. Do you know of any other films that have used (or, perhaps, overused) this piece?
And just for fun, here's a version rendered in a video style that I learned about from this post at Blogonomicon.