A wonderful thread because good cinema unites us and speaks to things we cannot say ourselves. I'm amazed at several common threads here.
I agree with many choices, but wish to add:
The Piano - so erotic, yet so subtle
Like Water for Chocolate - mentioned by others, but ditto above
Dogma - great Kevin Smith treatise on religion, I can't get enough of this guy (OK, maybe I can)
Manon of the Spring and Jean D'Florette - French filmmaking at its best (yes, I still love you, Francios Truffaut)
Local Hero - by a Scottish director, makes my top 5 list. You MUST see this one. A corporate player absorbed by a minute Scottish village with weird and wonderful characters.
Dr. Strangelove, or how I learned to stop worrying and love the bomb - title says it all about the nuke paranoia of the 60's
Little Voice - too hard to capsulize, but watch it
Shall We Dance? - Japanese with subtitles, but worth the effort
Crimes and Misdemeanors - Woody Allen when he's trying. I couldn't get this movie out of my head for days. That defines good film-making in my mind.
Secrets and Lies - wonderful and twisted family dymanics
Most underrated film of all time: Ishtar...I know what you're thinking, but the lyrics to those songs? Brilliant and I still laugh.
How many is that? I lost count. I confess, I love good movies. I think they are the best expression of what is good and worthy about humanity.
How's that for humble?