I recently tried to rip an "enhanced" CD (Andrea Bocelli - Sentimento) in iTunes, but it didn't see the CD since it mounted as a data CD and wanted to show me the content through a controlled player. However, I discovered that I could go into Disk Utility and mount just the Audio CD part of the CD, and iTunes saw it instantly and could rip it ...
Mac OS X Hints
http://hints.macworld.com/article.php?story=20071226134107599