I just run AnyDVD and use mencoder to do the rest. It usually only works on store bought DVD's and not burned ones because usually when you burn one to a blank DVD the software will compress it. I use the following command in my batch file:

C:\Progra~1\MPlayer\Mplayer\mplayer\mencoder.exe -vf crop=432:324,dsize=4/3,scale=240:180 dvd://1 -dvd-device D:\VIDEO_TS -o "C:\bb\dvd.avi" -of avi -ofps 24 -ovc lavc -oac lavc -lavcopts vcodec=mpeg4:vbitrate=230:acodec=mp3:abitrate=64

Note that I have included a crop feature to crop to full screen without stretching the video. Some movies don't turn out too well with the sides chopped off. You can change it according to the pixel ratio of the movie.