<warning:ramble>You can crack Mac programs using tools like the free Macintosh Programmer's Workshop. However, Macs use the Motorola architecture, so the assembly syntax is different for the most part.

As you mentioned, PC emulators can run various Windows/Linux versions which can run x86 cracking tools. I created a nice VBA virus under a PC emulator a number of years ago. Since I could create copies of the "hard drive file", I could test the virus out on system after system without having to reinstall Windows 98. (The same could be done on a PC running a PC virtual machine like VMWare, VPC4Win, Bochs, etc.)

I myself am studying assembly/Cxx x86 programming via a ton of books, my Athlon running XP (and DOS 6.22) and my old Mac PowerBook (using an old PC emulator running DOS).

I'm mainly a PC user (as they are superior and there's alot more software available for them), but find the Mac platform interesting as well. Someday I'd like to get a nice Ti PowerBook running the NetBSD-based Mac OS X and a modern PC emulator like Virtual PC 5 so I could run Windows 2000/XP on it as well. Unless a PPC emulator for Windows comes out (68k Mac emulators are already available for the PC).</ramble>