for the streetpass trick... need a broadcast SSID of attwifi with no password. I live in base housing so I'm not too worried about having anybody nearby who can sniff out and spoof a MAC (or who would even THINK to do it for that matter)
Another case for a business would be port security. If I try to move a computer around my office at work, the computer and the port would be instantly knocked off of the network. I'm fairly certain that it's MAC based...
Just broke my personal record for number of consecutive days without dying!
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