I wasn't sure if it is possible to make video in Flash, that is good for TV until I got to do one (it was some video editing and I got it by kind of accident =) and until saw it on screen during festival.
I didn't know how it will look like on big screen so I was scarred in front of all that people siting in audinece but anyway, even if it sucks noone there did know that I am author =)
The trick was to export all the frames as images for achieving best quality, the video guys manage the rest in compiling the images into a video. Sorely the QuickTime output was terrible.
Another thing to keep in mind about that was "KEEP IT SIMPLE" I used cycles and counters for pausing and random movements and had to rework to a simple single-timeline animation because on export these parts were just missing.