The dirty little secret that wireless access points are holding back: MAC Address filtering will not protect you at all.
“How could this be?” you say? Well, it’s really quite simple… when Steve Gibson explains it. He and Leo Laporte explain the problem with Wi-Fi and specifically the false sense of security with MAC Address filtering in their eleventh Podcast, Security Now! Unbreakable Wi-Fi Security. I heavily suggest you go and download this (various formats available) and listen to it very carefully if you use Wi-Fi. You’ll be very surprised… and educated to the true problems of 802.11b.