The site goes down because of a distributed "attack" in the wake of Aaron's death. Coordinating a distributed denial of service attack (as characterized in the worst possible light) is not a legal activity. Less crazy charges have been brought for other "hacking" activities.

Accessing "hidden" URLs has been called unauthorized access; deep linking or just linking to something like deCSS has been likened to a crime; port scanning has been legally attacked a few times.

If these same type of people think URLs are a crime, I don't think the scenario I described is that bizarre. Look up that news story about the guy in a glider near a nuclear plant (he was catching a thermal from the lake) -- there was never a no fly zone, but officials actually considered shooting him down! Instead they held him for 24 hours while his loved ones started a search for his glider. They dropped the charges only after he agreed not to sue them!