ripper + transcoder

• DVDFab.com (Ariel highly recommends this. It's payware, but since there's "no honor among thieves", it's undoubtedly available on bittorrent)

transcoder only

• DVD Shrink

ripper only

• DVD Decrypter

unsorted

• AnyDVD (and other SlySoft products) [download]
• HandBrake (tutorial)
• moar, moar, moar