I have a 32' Westinghouse HDTV sitting right next to my computer which I often hook up to use as a secondary or an external display. Up until now I had no idea how to make Quicktime full screen on it while using it as a secondary display.
Make Quicktime full screen while on a secondary display:
1. Hook up external display
2. Launch Quicktime Pro and open the preferences section
3. In the "Full Screen" tab simply drag the Quicktime logo to the screen you want to be able to do full screen on.