I have a Mac, and I want to be able to run multiple versions of OS X separately so I can test my applications under the different versions. I have two questions:
Is there any sort of virtualization that I can use, like vmware, to run OS X in a VM on a mac? I know you can't do it on a PC, but I'm specifically interested in running different versions of the OS on a mac.
Where can I get older versions of the OS to install? I have 10.5 on CD, but that's it.