I took a trip with my family in November to Chicago. We stayed in the Hyatt in downtown Chicago across the street from what appeared to be a high-rise apartment building. I’ve never seen so many Wi-Fi access points! The good news for the owners is that just a couple of them were unsecured. Are you sure your Wi-Fi network secured?
Oh, and for those people who do the “FBI Surveillance Van” gag – do you really think anyone would be dumb enough to believe that the FBI would announce themselves over a wireless network? And if they were that dumb, would they really be setting up their own wireless network?