In the video below, Jean-Michel Cousteau speaks compassionately and elegantly about the Orcas and dolphins kept in captivity, especially in relation to Tilikum 'Tilly' the Orca that recently killed the SeaWorld trainer, Dawn Brancheau. I had considered writing about it myself, but I couldn't put together the words in quite the way I wanted. Jean-Michel does so for me. Thanks to girl least likely to for bringing it to my attention.
Here's an article with a deeper interview with Jean-Michel Cousteau.
And, here's another article about the subject, which essentially compiles a lot of different reactions to the situation.
We need to try to make things better for the currently captive animals by moving them to sanctuaries that more closely resemble their natural habitat, and we have to stop capturing and caging more wild animals. It's simple. Put yourself in their fins, fur, tails, antennae...if you wouldn't want to live that way, it's not right for them either.
EDITED TO ADD (3/1/10): Apparently, we haven't learned our lesson. The show must go on. And instead of 20 people in the audience like when the trainer died, the first show back had 2000. All supporting Sea World, supporting using animals for entertainment. All not getting the big picture about animal welfare and caging wild animals.