Babel is one of my favorite all-time movies, both for the film itself, and for the daring way that Alejandro Inarritu worked with the actors and cultivated stunning performances despite language barriers. The film was made in a way that honored the film's themes. He should have absolutely won best director that year, as well as best film.
Here's a live performance of my favorite piece of music from the film by Ryuichi Sakamoto. It represents an entire emotional landscape... absolutely moving.