Sometimes these craft discs do work on Mac, albeit in a different way than on Windows. They appear as files which you can open individually once you have put the disk in and opened it. The Crafters Companion ones (and probably some others) are presented in a programme that only Windows can open but the individual elements can still be opened and printed off. I've done this myself because when I want to manipulate items the programme sometimes won't let me do it. Create and Craft presenters on television often explain this when they are introducing the CDs/DVDs. I would imagine that the ones that include a graphics suite might not work though. Thinking of the Serif DigiKits. I'm not sure about tutorial ones but do try it and see if it works. You maybe able to get information from it, albeit not in the way that Windows does it. Good luck and it would be nice to know how you get on.
You should be able to browse the CD to see if there are any PDFs or videos. Most tutorial disks bundle the files in an application but you can find the files and open them separately.
You can also run a windows virtual environment. I use VirtualBox, it is like VMWare or Parallels except it is free. You need to provide a windows install though. www.virtualbox.org
I was just recollecting that occasionally I've come across craft discs that use Adobe Reader. On Windows I use Foxit Reader but these particular discs would not play so I had to download AR to view them. If your disc uses Adobe Reader then you are in luck because they might be viewable in Preview. if not, the Adobe programme can be installed on a Mac.