I'd love to find a way to convert DVD-Audio discs to Apple Lossless as well. Haven't had too much luck with it though.
AFAIK, there are no drives that can read the high-resolution SACD audio.
This is actually possible (as long as Apple Lossless supports 24/96 and 24/192.)
There are some Windows tools that will let you rip DVD-A discs. Unfortunately, since this is getting past DRM, it's actually illegal in the USA under the DMCA. I encourage everyone to do it though, as you've bought the content (and paid quite a high price when it comes to DVD-A). It should be yours to do with what you wish.