I've got three dual discs that have enhanced stereo tracks on the DVD side of the disc.  They don't show up using DVDA Explorer, but DVDA Extractor will list them just not extract them.  Anybody have any luck getting the tracks off these types of discs?  

I've used DVD Extractor to successfully rip LPCM tracks from DVD-V discs, but never from DVD-A discs nor dual discs. It's possible they have some protections. If you can see the tracks it should be possible to get them off the disc. Have you tried foobar? I've read that using the http://sourceforge.net/projects/dvdadecoder/ you can rip those too, but since Foobar is Windows only, I've never tried it (nor that I have any DVD-A available either).

I'll try that plugin this week and see what happens.  I don't think I went that far last time as DVDA Explorer worked with the first two