My wife's old office used to be down the street from a Remax. They had wifi, oddly enough called ReMax. Open to the world. If for some reason someone was to connect to their wifi they would find that ever computer in their office (about 10) had file sharing turned on for drive c. After the fifth time I logged into their wifi router, a linksys wrt54g and shut down the wireless connection, which didn't help, I left txt files on every desktop telling them that all their customer data was open to the world. It also stated that there was a school right across the street where the kids that were on in school suspension went to class. Oddly enough a day later they had encryption enabled! It was wep, but hey, at least they were trying....