Looks like I'll have to try DivX again, at least for encoding AVIs for playback on the computer. When I tried it a couple months ago (v 5.0.2 I think) I didn't really like the image quality. I thought it wasn't as good as using Quicktime Pro 6 to play back an imported AVI or image sequence from Poser. Also, the DivX player included in the bundle kept crashing at the end of every clip. But I should try it again now that v5.0.4 is out (thanks for the tip Little Dragon).

Thanks to BYS for the insights on what actually constitutes a DVD-compliant stream. I had just been going by the Ulead or DVD Complete setup screens reporting whether the imported clip was being interpreted by the program as DVD-compliant or not. But maybe Ulead just interprets a 720x480 Quicktime MOV file as an MPEG.