I don't even have words for what this movie did to me. I let myself go so far into it, that by the last scene I was hugging myself, halfway to a panic attack in the theatre. And the quiet moment (you'll know what I mean) felt so much like grace, or divinity; I found myself wishing that reverance existed in our real lives, as much as I dread the possibility of the situation that created it.
This might have been the most valuable movie I've ever seen. And I'll probably never see it again--it was that visceral and horrible and real to me.
NPR talks to Cuarón about filming the extended scene towards the end of the film. Be aware that this is kind of spoiler-ish.
At Google Video you can watch Alfonso Cuarón, along with Guillermo del Toro and Alejandro Gonzalez Inarritu, on The Charlie Rose Show. I'd recommend watching it after you've seen the film--to cheer yourself up.
Children of Men
dir. by Alfonso Cuarón, 2006