I don't know if anyone saw Dateline this week, but they had a very interesting segment on ATM machines. It turns out that they planted this known felon (fraud and jewelry theft) on probation in a position to try and purchase and ATM machine. Only 1 out of the 12 did a background check. He was able to purchase the machine and set it up in a storefront. If you watch the video, you will see that a few days after putting it in place, he put a sign next to it with a reader built into it. The sign said, "Clean your ATM card for free." Tons of people fell for this. This was almost as good as the British station that handed out free, cheap pens in exchange for passwords. 90% of those people gave up their passwords.
http://www.msnbc.com/news/DATELINE_front.asp?cp1=1