I do not like Quicktime that much. I hate to use additional clients next to VLC to be able to view certain movies on websites. I also do not like the fact that you can’t save movies easily if you do not use Quicktime Pro. I discovered a method that makes it possible to save movies from the Apple Trailer website to your local drive and watch them in your favorite movie player afterwards. I use VLC for this purpose but Quicktime Alternative for instance should be fine as well.