A local Washington DC television news station wanted to do a WiFi "hack." Their plan was to sit in a local coffee shop (named after the Pequod's first mate) and try to read their neighbors' e-mail or Web browsing. They had a simple question for me: "Is it legal?" This raises a series of questions about how people are -- deliberately or accidentally -- breaking the law with WiFi. In fact, using someone else's wireless signal -- even if only to get Web access -- might constitute a felony. So could reading other people's cleartext communication, or even just putting...