As shown in this video on Youtube, anyone with a computer and can follow instructions could hack a WEP protected Wifi network in a matter of minutes. So if you are currently using WEP password to protect your network, change it to WPA or better yet, enable MAC address filter immediately.

How to hack WEP Wireless network video

Knowledge is power, but power doesn't mean you should be a jerk, or do anything illegal. Knowing how to pick a lock doesn't make you a thief. Consider this post educational, or a proof-of-concept intellectual exercise.