Mac Hacks Allow OS X on PCs -Wired:
Hackers have found a way to bypass a chip designed to prevent the Mac OS from running on non-Apple PCs, which are often cheaper than Macs. Some of the hackers are running the tweaked version of the operating system on their PCs natively.

OSx86 is designed to run on Apple Computer's next generation of hardware, which some call "MacIntels" and others "MacTels" because the machines will run on Intel microprocessors rather than the PowerPC processor used in current Macs. The hacked version of OSx86 is based on pirated software, which came from copies of the operating system sent to participants in the Apple Developer Connection.

No one knows exactly why OSx86 appears to be running faster on the PCs than the Mac OS does on today's Macs. The hacked OSx86 bypasses a chip, the Trusted Platform Module, or TPM, that is intended to prevent the system from running on ordinary PCs.