They prosecuted and convicted a guy under the CFAA for figuring out the URL schema for an AT&T website designed to be accessed by the iPad when it first launched, and then just visiting that site by trying every URL in a script. And then his lawyer (the foremost expert on the CFAA) got his conviction overturned:

www.eff.org/cases/us-v-auernheimer

We have to maintain that fight, to make sure that the legal system doesn’t criminalize normal computer tinkering, like using scripts or even browser settings in ways that site owners don’t approve of.