I use Quicktime for the following:
(1) source footage conversions
(2) intermediate renders
(3) masters
I've found Quicktime to be a very nice system for video production and video archiving. (Video distribution is quite another matter, obviously.)
If anybody's interested, http://www.heroinewarrior.com/quicktime.php3 provides a little more detail about the Quicktime4Linux library, and will hopefully make me look a little less weird for liking QT.
