Ok, I've added the complete names and years of release according to imdb - don't know if they are correct though.
I also haven't heard of most of these films, and seen none, although I own the Erice film. But my spanish is too bad to watch without subs. Don't know about any DVDs. 

I guess Saura's Cra cuervos (1976) would have made the list if it had been released one year later. How did it fare on the more recent poll John? From the little I've seen it's by far my favorite Spanish film.

Btw, it's incredible how high the imdb rating for the three Berlanga films is.