I am so glad to have found this thread. I have been working with Vegas Movie Studio for years, and just recently started to play with youtube. My videos for DVD have always looked great. The stuff I'm putting on youtube looks horrible.
I'll try some of the things mentioned here and see if I can't get things to look better.
YouTube - rctoyguy's Channel
There are only a couple out there now, and most of them are me trying every combination of rendering I can think of to compare.
Shouldn't I be able to get better looking stuff on youtube? I record on Mini-DV, transfer to the pc via firewire, and edit in VMS Platinum 7.