One night Hubby and I were driving around our neighborhood. I had my laptop with me because I was bringing it back from a trip. Just for fun, I turned it on while we drove, and saw how many unsecured wireless networks were available. About every three houses had a wireless signal that I could access for internet (and I'm in no way a hacker). Can you imagine how much access someone who really tried could get?
One more caveat (which you probably already know). If you unplug your router from your modem and computer for whatever reason (moving the computer, cleaning under the desk, hooking up new equipment, etc.), all your router settings default to the manufacturer's unsecured settings.
