I wonder if some here who say it's stealing have, at some point while traveling, checked their email by swiping some private wi-fi for 30 seconds. Fuss up, you know you have, or perhaps will at some point. But I don't think that's too serious. However, rippin' off your neighbor's wi-fi on a daily basis makes you just a bandwidth bandit.
http://www.cynicmag.com/feature.aspx?articleid=2432