Uhm, WOW!
I saw this today and it is way worth going to see. (It was not playing in my city so we actually drove about an hour to get to the cinema where it was showing.) I would highly recommend it to anyone interested in art, humans, animals, early humans, nature, preservation, earth, geology, exploration, etc. It is worth seeing in the cinema and not waiting for DVD at the library (which is what i usually do with movies)

http://www.npr.org/2011/04/20/135516812/herzog-enters-the-cave-of-forgotten-dreams

http://movies.nytimes.com/2011/04/29/movies/werner-herzogs-cave-of-forgotten-dreams-review.html