A little off-topic, but:

It seems pretty clear to me that using someone else's network, without their permission, is illegal. You probably won't be prosecuted, but it points up a trend: more and more things are illegal but not enforced (wearing seat belts, using cell phones in restaurants in New York, smoking in more and more places, sending unsolicited email, file sharing...). This puts us all in the position of being vulnerable to selective prosecution (the equivalent of wi-fi'ing while black, e.g.). The government can decide to prosecute those it doesn't like at any time, since we're all breaking laws increasingly. Maybe we need a meta-law that says that any law, if prosecuted sufficiently infrequently, is not valid.