Try DVDdecrypter. It's small and seems to work fine for ripping the .ISO of the movie, at least. Plus, it strips the copyright protection off of it - I'm not a proponent of distributing a copyrighted work, by any means, but I do like the image improvement w/o Macrovision or whatever it is on the source material.
My brother swears by DVD Xcopy as it will lightly compress/shrink the DVD to fit onto a DVD-R, but I'm cheap and try to use open source or freeware. Good luck - let us know what worked for you