I don't personally know of any software or techniques that will allow you to use PC VSTs on a Mac, and I can make a pretty good guess that there aren't any. Windows-based VSTs are made into a .dll and that's not simply a file extension, but an actual process for calling resources available in the operating system itself. Without a Windows operating system, a .dll file can't operate, as its entire functionality is dependent on the Windows operating system's resources.
There are plenty of Mac versions of plugins out there. A lot of developers make both versions for any plugin. It's just a matter of finding them. The KVR Audio website I mentioned before has plenty.
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