Source: http://feeds.gawker.com/~r/lifehacker/full/~3/M1cuci45hpg/know-how-to-spot-an-atm-skimmer
If you've seen warnings lately about ATM "skimmers"—data-reading devices added onto machines by thieves—you might be wondering how you could tell if one's been rigged up to where you're about to insert your card. The Consumerist blog hosts a PDF copy of a PowerPoint explainer from an Australian security firm (that still applies to U.S. machines). It might not cover what your specific bank's teller machines should look like, but it does point to warning signs to look out for—like the flashing lights on a card feeder being obscured. [Consumerist]