Whomever asked about Anime movies, obviously pretty much anything from Miyazaki (Spirited Away and Princess Mononoke being the best IMO, he kind of slaughtered the book version of Howls Moving Castle, by Dianna Wynne Jones, but it was still good).
the Cowboy Bebop movie is also good as stated. I also enjoyed the Ghost in a Shell movie.
But my favorite by far: Gundam Wing: Endless Waltz. It's amazing. I don't even like the Gundam series and I love this movie.