Just finished my guide.. No longer do you have to use Scenarist to mux your NTSC DVDs but can use the cheap DVDLab instead. Can't post this in User Guides thread since it's an external link...sorry http://www.mrbass.org/dvd2dvdr
For what its worth I have been using DVD-lab for a week or two now, from the beta to the new release version, and it is superb. Feature wise it beats most of the big boys yet is soooo easy to get to grips with.