If you keep up on the subject, FBI has been recently cracking down on ATM card data theft rings, where scammers attach fake hardware to the front of ATM’s and trick users into entering PIN information, then record the data to logging devices which can be retrieved later. In some cases the attackers use Bluetooth
We've already discussed a lo-tech but surprisingly effective attack on ATM users here and elsewhere. However, Brian Krebs has recently posted on more conventional skimming attacks: Green Skimmers Skimming Green. An interesting and useful comment thread too. However, in view of the mentions there of chip and pin technology, it's worth pointing out that while
Regrettably, pretty much anything could happen to your credit card while it’s out of your sight. However, the “ATM Card Skimming and PIN capturing Awareness Guide”, while it can’t cover every possible permutation of illicit additives to your friendly local ATM, does at least offer some guidance as to what to look for.