Dude, I already showed you this stuff in class :!: 8)
When you're exporting out from FCP, use Quicktime Compressor, not Quicktime Conversion. This is the same mistake that everyone in our DV class made. When we used quicktime coversion, we were losing over half the quality. So, in order to retain quality, export to quicktime compressor, select the highest quality for MPEG2 ALL, for video and audio. It will then export your video and audio files seperately. The thing is, when you're using i-DVD, you can't do anything with those files. You have to have DVD Studio Pro or an application specifically designed for high quality DVD authoring, that will allow you to place those files into its own timeline (almost identical to an NLE timeline) where you can still make modifcations to those files for authoring your DVD at in highest possible quality.
Kim, this all explains why the DVD you have of my work look like absolute crap, I used conversion instead of compressor.