Wired.com are running a story which says that:
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 …. 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. The ADC participants also received MacIntel computers for testing and development.
Now the hacked version of OSx86 is running on Dell laptops and other PCs with Intel and AMD microprocessors.
OS X running on Dell PCs and AMD chip PCs? Heads are gonna roll in Jobsville today!
You can bet that before the next generation of MacIntel computers ship, this issue will have been completely locked down – the last thing Steve Jobs wants is OS X running on non-Apple computers!
There’s a video here of OS X running on a PC laptop – be aware that due to heavy demand this video isn’t always available!
Also, there are not just but videos as well as instructions on installing 10.4 on an Intel machine. (In this case a Sony Vaio.) here.