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You know that feeling, don't you: Your neighbor has set up a wireless network, you switch on your PC and see it. It is completely open and unsecured - as they are out of the box. Now you have two options: Ignore it and leave your neighbor vulnerable or give him/her a call - and loose one of your precious evenings to configure yet another wireless LAN.
Well, there is a pretty good article on how to secure a wireless LAN, you could point your neighbors or friends to: http://www.dailywireless.com/features/secure-wireless-lan-021507/