After making a clean install of Leopard on my 1GHz 12" PowerBook, I am now able to read the regular redbook CD layer on hybrid SACDs. As has been reported by several users, these discs would previously not even show up in the Finder (or they showed up as an empty CD/DVD etc). It seems like Mac OS X is finally able to recognize these discs, which is useful for anyone who would like to rip the redbook layer on their SACDs!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20071209193744993