Once in a while, once in a lifetime, Once has earned a spot among my favorite films of all time. I'm not saying it's the best film I've ever seen, just saying that it belongs on the same shelf as the best of the best.
It's so rare that I am so completely blown away by a movie, much less one that cost a mere 160K and starred musicians that had never acted before. The credits were the shortest I've ever seen... this was a shoestring budget film that was so blessed and perfectly crafted. Props to all of the film makers for making a true diamond in the rough.
The music is a huge part of this film and it is also a remarkable accomplishment. Check out the wikipedia entry on this film for some great details about the making of Once.