DVD Platinum, 30 trial version, then about $40 for full version.
I spent ages trying to find something that would successfully copy all my DVD's onto my NAS drive. This does it perfectly, and very quickly, about 1 hour a DVD compared to some shareware/freeware that takes 10 hours.
Also has settings for downsizing the DVD for iPods, etc, will create AVI's for you etc.
Highly recommended and with a 30 day trial you can try it out on virtually your whole DVD library before the trial period ends
Taff