I am completly against places like SeaWorld. They are extremley cruel and should be banned.
Anybody wanting to watch the act of forcing killer whales to perform for food should realise the animals are doing it out of nessesity, not because they wish to entertain you.
Make up your own minds, however let me also point you to this article by the Whale Rescue Team -
http://www.whalerescueteam.org/projects.html , the "Anti-Capture Program" is a intresting read for those who believe places like Sea World are all about happy times and family fun.
I'm sorry but those of you who are animal lovers who have been to Sea World have been "had" into giving your hard earned cash over to a company that actively exploits these mammals. Believe it or not, you even helped pay for anti-depressants to be put in the fish they eat so they are more lively.