If there is one movie you watch this summer (what is left of it) go see Blackfish. I just saw it today and it definitely struck a chord. Many people know about the inhumanity of keeping orcas captive - this documentary focuses on the psychological effects it has on these highly intelligent and sensitive animals.
What hit me the most was the story of one of the boat drivers that captured orca calves in the 70s (sanctioned by Sea World)...he basically broke it down to kidnapping children from a family. Now Sea World breeds the whales and separates them from their mothers at an earlier age. In the wild, orcas never leave their mothers pod.
Watch the movie, and do not go to any more orca shows...