I'm not a lawyer, first of all, but I don't see how the contest is against the law and can lead to Apple sue them.
Let's see if I get this straight:
Imagine that the contest was "bring me proof of you killing someone and I will give you $100000". This is obviously illegal because you are inducing people to commit a crime, something obviously against the law. I think we all agree on this.
BUT the contest is "bring me proof of the existence of Apple Tablet". As far as I know, taking a picture of something and giving it to someone else is not illegal (we now the limits: national security, comecial spies, etc.). The purpose is to meake it public just ahead product release and not confirm it until the actual product has been release. You may say: but people have signed a NDA. OK, but a NDA is not the law, it is just an agreement between two individuals, and the consequences of breaking it are considered in the agreement itself (termination of the contract, etc). If you go to trial you think the judge is going to say " you go to jail for taking a picture"? No, that's not illegal. He might say " you have to pay so much to Apple for the money they have lost due to your picture", in case Apple can prove that they have lost money (actually I think it is quite the opposite as this is generating extra publicity). So the contest organizers are not inducing anyone to commit a crime in my opinion.
Can anyone (with law knowledge if possible) elaborate on this and tell me where I'm wrong?