if you want to run OS X but don't want to shell out your cash on a Mac Pro, check out Efi-X. all you have to do is get the motherboard/cpu/graphic card that is in their Hardware Compatibility List.
Interesting article here:
http://www.theinquirer.net/inquirer/news/501/1050501/efi-x-boots-us-partner
So, when you install OSX on a non-apple machine you're just doing what Apple doesn't want you to do. You're not breaking any laws. Sure, you're in breach of a contract and Apple could come after you for that. But, in all likelyhood, they wont. Because all they could get would be the cost of that copy of OSX. You do not go to jail. You could just be forced to pay Apple damages. That's it.
This shows an almost complete misunderstanding of the situation.
Apple is licensing its software. To make a copy of the software on the DVD, you need permission of the copyright holder, in other words, a license. If you make a copy that is not allowed by the license, that is copyright infringement. It has nothing at all to do with breach of contract. Copyright infringement costs between $750 and $150,000 in statutory damages per copy. It can be criminal if it is done for financial gain. It can be criminal if it involves violation of the DMCA.
Have a look at
http://en.wikipedia.org/wiki/Jacobsen_v._Katzer for precedent that if you have permission to copy software in agreement with a license (here: by installing it on a Macintosh), but copy it against the terms of the license (here: by installing it on a non-Macintosh computer), it constitutes not breach of license terms, but copyright infringement.
Psystar brought up a very good point with the First-Sale Doctrine, so from a legal standpoint, there's no problem with me buying Leopard and selling it to someone else -- besides, at that point I haven't even seen the EULA, much less read it.
The first sale doctrine allows you to resell exactly what you bought. If you bought a box with a MacOS X DVD and a license at a store, then you have the right to sell that box with the license to anyone you like, and there is nothing that Apple or anyone else can do about it. That's where the first sale doctrine ends. If you buy MacOS X Leopard and install it completely legally on an older Macintosh, then the first sale doctrine does _not_ allow you to sell that computer (but lucky enough, the license that comes in the box has explicit wording that allows you to sell it in this case). If you install MacOS X on a non-Apple labeled computer, that is (1) copyright infringement, (2) you lose your license to install the software anywhere, and (3) anyone buying that computer would commit copyright infringement every time the OS is launched and therefore copied into memory.
It doesn't matter much whether you read the license or not. The only difference it makes is whether you know your rights or you don't. As a consumer, not knowing what rights you (don't) have might be an excuse; for a company not knowing what rights they (don't) have is just stupid.
Uhhh... He's not Psystar. He's an end-user. It's not illegal for an end-user to do it, provided they also buy a copy of Leopard retail.
It's illegal for a company to SELL them, but not for an end-user to make his own computer, buy a copy of Leopard, and then make it a Hackintosh.
Actually, it is illegal. So what's the difference between Psystar and the osx86 project? Have a look here:
http://wiki.osx86project.org/wiki/index.php/Main_Page
You won't see one bad word about Apple there. It's all about happy people happily making MacOS X work on all these otherwise unhappy computers, doing the world a big favor and spreading the word about how good MacOS X is. On the other hand, you have Psystar with heavy rhetoric about evil, anti-competitive, monopolistic Apple who should allow Psystar to rip them off. So guess who Apple sues and who they don't sue.