Thanks for the tips. The xvid website seems to be down, couldn't download it.
mplayer choked on the movies I have, it did video fine but crapped out on audio. Which is weird since QT already played the audio part of those movies fine.
But VLC worked right, I can finally watch this stuff again. Haven't tried isquint yet, that will be next.
But hopefully the codecs will get ported soon. I've got a mini and I'd like to use Front Row to watch these, and share them over itunes.
I tried divx doctor, didn't work on intel because it depends on codecs that aren't native yet.