iSofter DVD Audio Ripper Deluxe provides a simple, fast method to extract DVD audio to MP3 Wav WMA or M4A format. No more multiple programs, no more complex progress, as easy as 1-2-3.
It can not only rip DVD chapter by chapter, but feel free to rip by custom size or time. With DVD playback supports, you can rip anything as you like, no temporary file required. It also supports Multi-Angle DVD and copes with these Multi-Angle chapters in right way. With new tech supports, it works well and fast with all types of DVD.Now you can listen to your favorite movies on your iPod or Zune Player!
…
More information at DVD Audio Ripper  

I found an excellent conversion software - TuneCab Ultra! It can convert protected and unprotected audio, video, extract sound from video, remove DRM, download and convert video from YouTube etc. Easy to use all in one software! http://www.tunecab.com