google search. I have tried many dvd ripper . freeware such as handbrake , super shareware such as wondershare, iskysoft I recommended you to use iSkysoft. It is cheap and can convert dvd to mpg files with high quality.
I tried iSkysoft DVD to iPod Converter. The conversion speed is so so. But the quality of the output files is Ok. It is easy to use. I like its trimming and cropping functions. But it is not freeware.
Handbrake is free. It supports Mac OS X and PC. I have iSkysoft dvd to iPod converter and it does a decent job. It probably takes 30 minutes to rip a full-length movie with sound and picture quality set to maximum. The iSkysoft DVD to iPod converter is $29. There are versions for Mac and PC users.