QTViewer is designed to be a replacement for the default Quicktime Movie Player that ships with Mac OS X. Its features include the ability to keep a player window on top of all other windows. You can remove title bar information so only the movie shows. It allows you to play a movie at different speeds, adjust audio up to 200% for quiet movies, and play movies at any size desired.
What's new in QTViewer
Version 1.4.1 brings about the ability to crop movies manually or automatically (get rid of black bars), "Fit to screen" (maximize while keeping perspective), User preferences, auto pause/mute when deactivated. And the greatest feature of all, Panther support!