Are you looking for famous attacks? Or are you trying to gather a cross-section of vunerablilities in the last few years?
You might have a hard time finding a lot of informationon case-studies, since most companies don't really want to talk about their insecurities...
A good idea would be to utilize google... a sample quick search:
http://www.google.com/search?q=famous+unix+hacks
If you're looking for specific information on old vunerabilities, check
rootshell.org. I don't know if it's still up, but I don't think they've updated in months even, maybe years...
A more current site with tons on information is
packetstormsecurity.org.
Let me know if you're looking for something more specific.