I was poking around Versiontracker today, and noticed a listing for MediaEdit <http://www.versiontracker.com/dyn/moreinfo/macosx/23330>. It's supposed to allow non-destructive editing of .mp4, .avi, & .dv, as well as .mov. Sounds nice if it works, but there are only 3 comments and the developer's website forum is pretty bare. No comments here, either. Anyone try this?