I bet you didn’t know that Frontrow, Apple’s Media Centre software that ships with every Mac, can actually playback those HD trailers from their site. Well here is a quicktip to enable that functionality:defaults write com.apple.frontrow EnableHDMovieTrailers TRUE
Once you type this into terminal, start up Frontrow and note that you get a new option under trailers. To disable this functionality issue the following command from a terminal window:defaults write com.apple.frontrow EnableHDMovieTrailers FALSE