As I've written before, I'm generally not a fan of book trailers. I tend to find them amateurish, and for most authors (who aren't bestsellers), they're very difficult to bring to the attention of potential readers.
However, every once in a while, one will actually impress with its creativity and unique vision. The best one I've seen in quite a while is for Brad Meltzer's upcoming thriller, The Book of Lies.
I've never gotten into Meltzer's work before, but this video is intriguing enough to at least make me want to pick it up.