Apparently, it comes as a result of discussions at KiwiFoo '08 - the conference where only the cool kids are invited, and everyone else gets jealous and calls them names (like "kids").
Personally, I'm running an open wireless network. Partly because of the golden rule, but partly because I just find it really convenient. The SSID is 'free wireless - dubdot.com', so people know it's intentionally open, and can contact me if they want. But, as I'm stuck in the middle of suburbia, nobody has.