I do hate to be the bearer of bad news, but using *most* public internet sources, unless they advertise 'Free Wireless Internet', it is very illegal to do.
That being said, I've spent a good deal fo time cracking WEP, and I plan on geting into all the wireless accesspoints in my neighbor hood, so I can go roaming around town with Internet.
Now, however, if you have a verizon phone, there's a much easier way to get free internet, through the data cable... more on that latter, once I've confirmed it works, and only uses air-time minutes. (And it's about 128k/s)
--Chris