I just saw the Motorcycle Diaries, which I thought was a really wonderful film. I was quite happy to find out that the director Walter Salles also directed one of my favourite films 'Abril Despedaçado', which is perhaps more widely known as Behind the Sun in English speaking countries.
There are so many foreign language films that I have really enjoyed. I simply can't name them all, but one that does come to mind is 'The Son's Room'. It is an Italian film that was written, directed by and stared Nanni Moretti. It is such a beautiful and poignant portrayal of human suffering and tragedy.