I'm a loyal Apple customer, but as I said, it is not illegal. Breaking a EULA is not breaking a law, it's breaking an (rather unfair) contract. That is why it's a question of who has the better lawyers and how the judge feels to interpret it. If I choose to install OS X on a Dell Mini 10v, that's not breaking a law; I will not get arrested for that. Apple may choose to sue me, but it's not likely to hold up.
Besides, clicking "next" and "agree" buttons is not at all the same as signing a document; a judge can easily decide to forego an argument like that.
Contract law is LAW. Civil law may not send you to jail but you are still breaking a law. Please don't think criminal law is the only form of law.
The contract is perfectly fair. Apple has every right to say you can only run OS X on Apple hardware. As Psystar proves Apple is VERY likely to win.
Clicking Agree counts as an e-signature which is completely valid under contract law (google the Uniform Electronic Transactions Act)
Section 7 gives legal recognition to electronic signatures, records and contracts
(a) A record or signature may not be denied legal effect or enforceability solely because it is in electronic form.
(b) A contract may not be denied legal effect or enforceability solely because an electronic record was used in its formation.
(c) If a law requires a record to be in writing, an electronic record satisfies the law.
(d) If a law requires a signature, an electronic signature satisfies the law.